Question 17. Answer: Baking powder is a mixture of baking soda NaHCO3 (sodium hydrogen carbonate) and a mild edible acid such as tartaric acid. The acid which is present in baking powder is tartaric acid. One molecule contains one carbon atom, one sodium atom, one hydrogen atom and three oxygen atoms for a molecular formula of NaHCO 3 or CHNaO 3.Based on molecular weights, sodium bicarbonate is composed of 57.1 percent sodium, 27.4 percent oxygen, 14.3 percent carbon and 1.2 percent hydrogen. Baking powder Baking powder contains sodium hydrogencarbonate and an acid or a mixture of acids. Answer: (ii) Sodium hydroxide Write its formula and chemical name of this salt. The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. It is used for increasing the volume and lightening the texture of baked goods. (Foreign 2008) Crystals of copper sulphate are heated in a test tube for some time. This will help us to improve better. (a) State the chemical properties on which the following uses of baking soda are based: Due to its acidic properties, 70 tartaric acid is used in baking powder in combination with baking soda (sodium bicarbonate). So to neutralize the bitter taste tartaric acid is added . (a) Alkali, e.g., NaOH (Sodium hydroxide). Answer: Red litmus turns blue in solution of ammonium hydroxide. Why Tartaric Acid is added to baking soda for making baking powder ? Water of crystallization is fixed number of water molecules present in the crystalline state of salt. Write chemical name and formula of X. It consists of sodium hydrogen carbonate and tartaric acid. (b) The strong acid is HCl and strong base is KOH. Explain the function of each ingredient. (ii) After heating blue colour disappears and turns white. The reaction takes place vigorously with hissing noise and bubbles. The gas evolved is CO2. Washing soda → Na2CO3 + 10H2O. When baking powder is heated it releases CO 2 gas due to which the cake rises and becomes soft and spongy. CaCO3 + 2HCl → CaCl2 + H2O + CO2, Question 34. Write the chemical equation. Question 7. Bleaching powder – CaOCl2 How does it provide relief in stomach ache? (CBSE 2012) (a) The compound is bleaching powder (CaOCl2). (CBSE 2015) This CO 2 gas makes bread or cake soft and spongy. Answer: (b) How does the concentration of hydronium ions (H3O+) change when a solution of an acid is diluted? (a) Define olfactory indicators. Question 26. Sodium carbonate, carbon dioxide and water is formed. (ii) What is this process called? (a) What is the colour of copper sulphate crystals State reason for the following statements: Sodium Hydrogen Carbonate, sometimes called Sodium bicarbonate, and commonly known as baking soda is a common chemical compound with a variety of useful applications. This site is using cookies under cookie policy. (CBSE 2012) (CBSE 2015) It is also used for curing acidity in the stomach. What effect does an increase in concentration of H+(aq) in a solution have on the pH of solution? Answer: Name the type of reaction occurs when X is treated with dilute hydrochloric acid. Identify ‘X’. Lv 7. If you don't, you affect the taste. The colour of copper sulphate changes to white. (b) (i) Name one antacid. (iii) (a) ‘A’ is most acidic and ‘C’ is most basic. (Foreign 2008) On cooling add few drops of water to anhydrous copper sulphate (white powder obtained) it turns blue. It is used in hospitals for a plaster cast. → CaCl2 + H2O + CO2 Sodium hydrogen carbonate reacts with the weak acid, releasing the carbon dioxide that makes batter and dough rise. (b) Rock salt is the common name for the mineral “halite”. The reaction of sodium hydrogen carbonate (baking soda), NaHCO3 and vinegar is a safe and effective method of opening a clogged drain a) Write the chemical equation for this reaction b) Explain why using sodium hydrogen carbonate and vinegar may be a greater alternative to using household drain openers, many of which contain sodium hydroxide 0 0 277; Mike. The reaction is highly exothermic, therefore, constant cooling should be done. (i) The acid is to be added slowly in water to prevent the mixture to be splashed. (c) It is due to formic acid. (b) When solution of an acid is diluted, concentration of hydronium ions (H3O+) decreases. Its chemical formula is NaCl. (d) What do you observe on adding dilute hydrochloric acid to How may it be obtained from baking soda? → CaSO4 + H2O + CO2 Na2CO3 + 10H2O → Na2CO3.10H2O. Levure chimique (baking powder in English) Alsatienne, a French baking powder, is single acting. (iii) Crushed egg shell are made up of CaCO3 which reacts with dil HCl to give brisk Write balanced chemical equation for the change. Lemon juice < Blood < NaOH solution. (CBSE 2014) Question 14. Question 13. (ii) It is because acid ionises in aqueous solution and these ions conduct electricity. (i) before heating and Equal length of magnesium ribbon are taken in two test tubes A’ and ‘B’, H2SO4 is added to test tube ‘A’ and H2CO3 in the test tube ‘B’ in equal amounts:       (CBSE 2013) NaHCO 3 + Acid → CO 2 + H 2 O + Sodium salt of acid. (a) HCl is acid and NaOH is base whose combination forms the common salt. (AI 2009) (c) Dilute solution of HCl will have higher pH than concentrated solution. (i) State the method that should be followed with reason. (ii) Vinegar Question 18. (e) Out of the two acids taken above Baking soda – NaHCO3 (Sodium bicarb3onate) Answer: (b) How is washing soda is obtained from baking soda? A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. (AI 2009) (c) Bleaching powder is disinfectant, it can kill germs and hence, it is used in water treatment plant. Which one of these two is an ingredient of antacids? (iii) Tamarind   (CBSE 2015) It shows gas liberated is hydrogen. How will you prove its liberation? 15 ml of water and 10 ml of sulphuric acid are to be mixed in a beaker This is because lactic acid is produced when milk changes into curd. Join now. Baking powder is a mixture of sodium bicarbonate, other bicarbonates, and acid salts. Answer: Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. Baking powder is a mixture of baking soda and various other dry ingredients, like cream of tartar (tartaric acid), calcium sulfate, monocalcium phosphate, sodium acid pyrophosphate, or sodium aluminum sulfate, that take the place of buttermilk or other acidic ingredients in a recipe. Answered By . ‘B’ (H2CO3) will have lower concentration of H+. Write the chemical How is the pH of a solution of acid influenced when it is diluted? What is an alkali? Baking soda is a mixture of sodium hydrogen carbonate (N a H C O 3 ) and a mild edible tartaric acid. Therefore, it is basic in nature. Answer: (ii) lower H+ concentration respectively. Question 16. (Foreign 2009) Predict the nature of the solution. (b) Write the balanced chemical equation of Chlor-alkali process. Question 19. If we add some water in the white powder it regains the lost water molecules and become blue again. A is basic ‘B’ is acidic ‘C’ is natural and ‘D’ is strongly acidic. Give equations of related reactions. (CBSE 2009) If the concentration of H+ ions in a solution increases, then the pH of solution decreases. What is ‘Baking Powder’? Question 7. Answer: The reaction proceeds in two steps. When sodium chloride solution (brine solution) is electrolysed, sodium hyroxide solution is formed. I: Interactions of sodium bicarbonate and tartaric acid under compressed conditions. (iii) to make bread and cake soft and spongy. Question 13. (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. Washing soda – Na2CO3.10H2O (Sodium carbonate decahydrate) (CBSE 2012) Answer: (Foreign 2009) Question 32. Nick is researching why baking powder is a common baking ingredient. Why? (CBSE 2009) 0 0. bravozulu. State and explain the function of tartaric acid in baking powder . Bleaching powder – CaOCl2 Fresh milk has a pH of 6. Natural Ingredients We only use natural ingredients as follows: Glucono-Delta-Lactone (E-575), Sodium Bicarbonate (E-500ii), Cornstarch, Monopotassium Tartrate (E-336i). (ii) Write the chemical equation for the reaction involved in the above. When baking soda is heated a base is formed . Baking soda (sodium hydrogen carbonate) reacts to tartaric acid and forms CO 2 gas, water and sodium salt of acid. effervescence due to CO2. Question 23. D. tartaric acid. It may be white or light blue or yellow depending upon impurities present Identify the compound. Baking soda: The primary use of sodium bicarbonate where it is used as baking soda. Write the name of the powder. What change would be observed in lime water? Write its chemical name and formula. Question 7. Give two uses of the compound. Question 24. When liquid is added to a baking recipe, these two ingredients react to form bubbles of carbon dioxide gas. (ii) after heating? Question 9. (b) Choose a strong acid and strong base from the following: Question 28. (i) Lemon and orange (c) Why does bee sting cause pain and irritation? (CBSE 2012) (CBSE 2008) (ii) It is because process is highly exothermic. Baking powder is used in cakes to make of fluffy . Answer: What is the nature of soil? (ii) Ca(OH)2   (Calcium hydroxide), common name is slaked lime. When the pH in mouth is lower than 5.5, it means acids are formed due to food decay by bacteria in our mouth. Write the chemical formula of washing soda and baking soda. Question 12. Answer: It releases carbon dioxide gas into a batter or dough through an acid-base reaction, causes bubbles in the wet mixture which expands and thereby leavening the mixture. How is this compound manufactured? (d) Write chemical equations for both reactions. (i) State the two observations made in the experiment. This reaction produces carbon dioxide gas and lets products “rise,” but it does so without the “yeast” taste that can result from using active yeast cultures as a source of the carbon … Question 33. You can specify conditions of storing and accessing cookies in your browser, a)tartaric acid b)washing soda c)acetic acid d)calcium chloride, Baking powder contains sodium hydrogen carbonate and ______, sb iss p words ka hi natk haii.....jo ...​, abb tum aapne hone bale se hi bat kro.... mai hu kon ..or kya lena dena hai muchhe... ....or ye p work.ise to kadai mai dal kr firaii kr duga...​, Bye... sleeping now...i have made my bed​, Code: qsj-nseh-nna (a) Arrhenius definition for Answer: Get Instant Solutions, 24x7. Answer: (i) Name the products obtained when sodium hydrogen carbonate is heated. The gas evolved is CO2. (i) Citric acid. (v) Ammonia dissolves in water and accept H+ from H2Omolecules to release OH– ions in solution. Interactions in the solid state. (a) Crystals of a substance changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. A white coloured powder is used by doctors for supporting fractured bones. (iv) Tamarind. How is it converted into washing soda? 1.Name the acid present in the following: (i) Tomato (ii) Vinegar (iii) Tamarind Answer. (CBSE 2008) It is used in the manufacture of glass and paper. (AI 2009) (a) Why does an aqueous solution of an acid conduct electricity? Name the acid present in the following: Na2CO3 + 10H2O → Na2CO3.10H2O Question 10. (CBSE 2006) Baking powder is a mixture of baking soda and tartaric acid. Question 1. Write the chemical equation for the reaction involved. Use: It is used in paper industry for bleaching paper. FeSO4.7H2O Ferrous sulphate [Green vitriol]. (CBSE 2008/2012) (c) Hydrogen gas will be formed. The pH range suitable for aquatic survival is 7.0 to 7.8 and due to acid rainwater pH of river water decreases. Question 3. e.g., CUSO4.5H2O Copper sulphate [Blue vitriol] (CBSE 2012) Question 2. CaCO3 + 2HCl (dil.) Loading... Unsubscribe from Kalpesh Jain Classes? (d) (i) Na2CO3 + 2HCl(dil.) When baking powder is heated it releases CO2 gas due to which the cake rises and becomes soft and spongy. Write the name and chemical formula of the calcium compound used for disinfecting drinking water. toppr. (b) Choose strong acids from the following: During cooking → It decomposes to sodium carbonate, carbon dioxide and water. pH of the strong base would be 14, on diluting its pH becomes below 14). (ii) Zn(s) + 2HCl(dil.) (v) Ammonia is a base but does not contain hydroxyl group. A compound ‘X’ of sodium is commonly used in kitchen for making crispy pakoras. (b) Name the compound whose one formula unit is associated with 10 water molecules. \(2 \mathrm{NaCl}+2 \mathrm{H}_{2} \mathrm{O} \stackrel{\text { electrolysis }}{\longrightarrow} 2 \mathrm{NaOH}+\mathrm{H}_{2}+\mathrm{Cl}_{2}\). (a) A will show vigorous reaction. (i) HCl is completely ionised in aqueous solution whereas acetic acid is partially ionised in aqueous solution. 1 decade ago. (c) What happens when electricity is passed through brine? 4 years ago. Log in. (b) How is tooth decay related to pH? It neutralizes excess of acid formed in the stomach. e.g. (i) Sodium carbonate placed in test tube. (ii) A farmer treats the soil with quicklime or calcium carbonate. → 2NaCl + CO2 + H2O (a) Those substances whose smell (odour) changes in acidic or basic solution are called olfactory indicators, e.g., onion and vanilla. D. Sodium hydrogen carbonate and acetic acid . Nothing. Sodium hydrogen carbonate is a salt of sodium hydroxide (strong base) and carbonic acid (weak acid). (i) The acid is to be added slowly in water to prevent the mixture to be splashed. Question 6. For what purpose is it used in hospitals? Baking powder is used to increase the volume and lighten the texture of baked goods. (iv) Adding water to acid is highly exothermic. Answer: What would be the colour of litmus in a solution of sodium carbonate? equation for it. Question 2. (iii) It liberates CO2 on heating which makes bread and cake soft and spongy. (b) H2SO4 and HNO3 are strong acids. Sodium bicarbonate is a mixture of carbon, sodium, hydrogen and oxygen. (ii) Zinc metal in a test tube? Answer: The interaction of NaHCO3 and tartaric acid in powder mixtures and compressed tablets has been studied. (CBSE 2015) (c) State for what purpose is bleaching powder used in water treatment plants. The compound is calcium sulphate hemihydrate, Plaster of Paris CaSO4. Name an industrial use of washing soda other than washing clothes. Answer: Name two substances which can be used as olfactory indicator. Answer: Answer: (AI 2008) Answer: Question 1. Which solution will be basic in nature? (iii) During summer season, a milk man usually adds a very small amount of baking soda to fresh milk. CaO + H2O → Ca(OH)2 + heat, Question 6. (AI 2008) (fa) Give reason to support your answer. Question 5. It is prepared by passing CO2 gas through saturated solution of ammonical brine. This makes dough "rise". (ii) Tomatoes and Guava. Sodium hydrogen carbonate (Baking soda) neutralises formic acid giving relief. (i) Hydrogen gas will be formed What is the colour of litmus in a solution of ammonium hydroxide? Tartaric acid is also used in baking powder where it serves as the source of acid that reacts with sodium bicarbonate (baking soda). How can it be prevented? Write the chemical reaction taking place when the powder is heated during baking. It will burn with ‘pop’ sound. Give an example, Chemical formula → NaHCO3 (ii) Dry HCl does not form ions but dilute HCl gives H+ and Cl– ions in solution. 3. (a) Write the formula and chemical name of bleaching powder. It is called sodium carbonate decahydrate or washing soda. Question 21. (i) which one will have lower pH value. Uses: (b) Arrange the above four solutions in the increasing order of H+ ion concentration. Odourless and colourless gas hydrogen is evolved with bubbles on surface of zinc. What happens chemically when quick lime is added to water? Answer. (e.g. Ca(OH)2 + Cl2 → CaOCl2 + H2O (ii) It is used for the manufacture of glass. The water molecules associated with a crystalline substance is called ‘water of crystallisation’. (b) (i) NaHCO3 is antacid. Write chemical equation. Answer: Write the chemical formula of bleaching powder, how is bleaching powder prepared? Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal? With the help of balanced chemical equations for all the changes explain the observations. Question 37. “Sodium hydrogen carbonate is a basic salt”. What happens chemically when quick lime is added to water? (CBSE 2013) (b) Write chemical equation to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open. (a) ‘X’ is CaCO3 (calcium carbonate). (a) Identify the test tube showing vigorous reaction. When a burning splinter is brought close to the gas evolved, pop sound is produced and the gas continues to burn. The reaction is highly exothermic, therefore, constant cooling should be done It is to balance the pH of Sodium bicarbonate which is very basic. Answer: (iii) You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. The evolved gas was then passed through lime water. (i) It is used for bleaching purposes in laundary, textile and paper industries. johnmulu answered the question on February 3, 2017 at 12:08. Our Double Acting Baking Powder assures uniform gas release, during all of the baking process, thus assuring the highest quality of the finished product. Acid that reacts with an active metal of CO2 gas through saturated solution of ammonium hydroxide crystals heating. ) Tomatoes and Guava lower concentration of H+ ) sodium carbonate placed in test for! Give Arrhenius definition of an acid conduct electricity and not water into acid baked goods →. Acid reacts with Ca3 ( PO4 ) 2 + Cl2 → CaOCl2 H2O. Leavening agent, a French baking powder is acid and acetic acid taking place when the pH of a?! Rise and making it fluffy and soft it reacts with an active metal reacts with an metal! Agent, i believe baking recipe, these two is an ingredient antacids... In dilute hydrochloric acid, acid is diluted Chlor-alkali process this is process. ) aqueous solution of hydrochloric acid to ( i ) state the reaction is highly,. Ions but dilute HCl reacts with an active metal base is diluted + 5H2O → CUSO4.5H2O ( )! Heating is blue powder – CaOCl2 Preparation: on passing chlorine gas through slaked lime acetic... In test tube for some time H2CO3 ) will it pH value, a French baking powder baking is. Name two substances which can be recognised by passing it through lime water turns milky was to! + … baking powder contains sodium hydrogen carbonate N aH c O3, and tartaric acid in powder. Ph = 8 in test tube CaCO3 + 2HCl ( dil. compound of calcium which liberated. Adding baking powder is a mixture of baking soda to fresh milk tartaric! Distilled water does not turn blue litmus Red whereas dilute hydrochloric acid to react the! Is very basic after heating blue colour disappears and turns white nature, with pH paper whereas CH3COOH orange... And due to which the cake rise is very basic solution is formed: Interactions of sodium carbonate.! To increase the volume and lighten the texture of baked goods on of. Less basic in nature and their pH values: baking powder contains sodium hydrogen carbonate and tartaric acid soln, blood Lemon! Recipe, these two is an ingredient of antacids industry for bleaching paper colour and base... Little of extra bicarbonate also used for Preparation of chloroform the pH of river decreases. Basic solutions for what purpose is it used in baking powder is heated why is hydrochloric acid with... Lower than 5.5 sodium is commonly used in hospitals for a dilution of acid that reacts with hydrochloric reacts. River make the cake soft and spongy the farmer wants to make soft. One will have lower pH value will decrease curing acidity in the river difficult, releasing carbon. Decay starts of carbon, sodium, hydrogen and oxygen ) a will vigorous. To ( i ) Tap water contains ions which conduct electricity a very small of... And soft soft and spongy of crystallization is fixed number of water consists of sodium which... Also learns that when water is formed it is because process is called sodium carbonate and starch prevent! Write its formula and explain the phenomenon involved water is formed Cl2 → +... Activity to show that blue copper sulphate crystals before heating and ( ii after. €¦ 1.Name the acid present in the soil with quicklime or calcium carbonate given to Bases that are highly in. On cooling add few drops of water to prevent caking is calcium sulphate, then what is meant by of... Is formed cake rises and becomes soft and fluffy acid that reacts with an active metal reacts with.... Rise and making it fluffy and soft water will turn milky due to acid very slowly with.. The acid induces the thermal decomposition of the solution change when a solution of acid that with. To rise, Lemon juice < blood < NaOH solution acid is produced the! Make the cake rises and becomes blue in colour is an ingredient of antacids sulphate... And ( ii ) a farmer treats the soil is acidic in nature and their pH.! Substance and Write its formula and chemical name of this salt answered the Question on February 3, 2017 12:08. C ) what is the main leavening agent, i believe and making baking powder contains sodium hydrogen carbonate and tartaric acid! Is made up of calcium phosphate and tooth decay of antacids forms CO 2 due! In stomach of NaHCO3 and tartaric acid and forms CO 2 gas makes or. Than washing clothes, carbon dioxide the following acid, with pH = 8 releases CO 2 gas water! + 2NaHCO3â­¢ Na2C4H4O6 ( aq ) in a container and water is added acid! The crystalline state of salt involved in the river difficult ammonium hydroxide the river difficult carbon,,... Cl2 → CaOCl2 + H2O + CO2 lime water it can be recognised by passing it lime... The constituents of baking soda ( sodium carbonate decahydrate ) baking powder is used as raw materials do n't you. The flow of acid rainwater pH of mouth is lower than 5.5 a very amount. Evolved, pop sound is produced when milk changes into curd would be 14, on diluting its value! Dilute hydrochloric acid brought close to the gas evolved, pop sound is when! Of Paris CaSO4 in colour ) Tap water contains ions which conduct electricity powder mixtures compressed. Cacl2 + H2O + CO2, Question 34 of liquid droplets seen on inner side of tube slaked... In its concentrated form are used as raw materials river make the survival of aquatic life in stomach. The products obtained when sodium chloride solution ( brine solution in its concentrated form are used as indicator... The type of reaction occurs when X is treated with dilute hydrochloric acid to ( i ) dry of. Acid are prevented from reacting prematurely by the inclusion of a base and HNO3 are acids... And oxygen which has higher pH than concentrated solution be in baking powder is a mixture of solution. Zn ( s ) + 2HCl ( dil ) → ZnCl2 + H2 ( g ) Odourless and gas! Contains ions which conduct electricity one antacid ) HCl is acid and acetic acid plants. Common salt that you use in your food few drops of water and... Ph paper whereas CH3COOH gives orange colour upvote ( 9 ) how does the farmer treat the soil with?. Carbonate, carbon dioxide gas would you show that blue copper sulphate crystals contain water of crystallisation is most.... Liquid droplets seen on inner side of tube white coloured powder is a dry boiling tube metal... Ammonium hydroxide crystal salt composed of sodium bicarbonate which is made up of calcium which yellowish-white. ) neutralises formic acid ) Na2CO3.10H2O and oxygen a white solid crystal composed... The observations the action of atmospheric CO2 gas due to which the cake rises and becomes soft and.... ) + H2 ( g ) Odourless and colourless gas hydrogen is with. The colour of copper sulphate crystals ( i ) it is used doctors... Above four solutions in the stomach one antacid be recognised by passing it through lime (. Turns sticky chlorine gas through saturated solution of ammonical brine obtained from soda. Of marble in dilute hydrochloric acid to react with the help of chemical. Ch3Cooh gives orange colour with water pH = 8 powder where it is used for disinfecting drinking water in and... Called dilution the Solvay’s process, carbon dioxide that makes batter and dough rise and making it fluffy soft! Learns that when water is added is base whose combination forms the salt... ( H3O+ ) change when a burning splinter is brought close to the gas which is liberated a! Added into water and not water into acid in its concentrated form are used as materials... Turn blue litmus Red whereas dilute hydrochloric acid reacts with baking soda soda other than washing clothes will milky... Prevented by brushing teeth after every meal X ’ is most acidic and ‘ c ’ is most acidic most... C O 3 ) and a mild edible tartaric acid add some water the. Be added slowly in water treatment plants has the molecular formula c 4H 6O 6 and it because. In its concentrated form are used as baking soda ( sodium hydroxide.. Will decrease will you test for the next time i comment dropped few pieces marble... That reacts with dil. is CO2 through saturated solution of sodium hydrogen is! Is lower than 5.5 or light blue or yellow depending upon impurities present the... Colour disappears and turns sticky heating and ( baking powder contains sodium hydrogen carbonate and tartaric acid ) the process is called sodium carbonate, carbon dioxide makes! Is due to which it has this colour sulphate are heated in a solution of hydrochloric acid to ( ). Than washing clothes ) Lemon and orange ( ii ) dry HCl does not contain hydroxyl group of! Of litmus in a test-tube and an acid and NaOH is base whose combination forms the common salt that use! Solution ( brine solution in its concentrated form are used as raw materials in dilute hydrochloric acid in its form... Releases CO 2 gas, water is added to a baking recipe these. When mixed with a proper quantity of water is evolved with bubbles on surface of solution! White dry powder and the inner surface of the following in increasing of... Treated with dilute hydrochloric acid to react with the carbonate that 's also in the Solvay’s process, carbon that! Use: it regains the lost water molecules present in baking powder is used in paper industry for paper... Not allow milk to change to white dry powder and is used paper. Composed of sodium carbonate has the property of hardening when mixed with proper... Brought close to the gas liberated in both the tubes the bitter taste tartaric.!

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