Answer: (CBSE 2015) (CBSE 2012) How would you show that blue copper sulphate crystals contain water of crystallisation? If excess of CO2 gas is passed through lime water, milkiness will disappear due to the formation of Ca(HCO3)2(aq) which is soluble in water. (CBSE 2012) (Foreign 2008) (ii) Zn(s) + 2HCl(dil.) (ii) after heating? 3. Answer. Solid calcium oxide was taken in a container and water was added slowly to it. Answer: (CBSE 2008C) Write the name and chemical formula of the calcium compound used for disinfecting drinking water. (d) What do you observe on adding dilute hydrochloric acid to (ii) as a soda acid fire extinguisher In Baking. This is because lactic acid is produced when milk changes into curd. (c) Name the gas liberated in both the tubes. (i) The acid is to be added slowly in water to prevent the mixture to be splashed. What will happen if excess of gas is passed through lime water? 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. To show the water of crystallisation in copper sulphate: Question 13. Name two substances which can be used as olfactory indicator. (CBSE 2012) (b) Lower the pH, more will be tooth decay. Answer: (c) Which has higher pH value, a concentrated or dilute solution of hydrochloric acid? What is the nature of soil? (a) The compound is bleaching powder (CaOCl2). A white powder is added while baking breads and cakes to make them soft and fluffy. (b) Rock salt is the common name for the mineral “halite”. Sodium hydrogen carbonate and tartaric acid. (iii) Crushed egg shell are made up of CaCO3 which reacts with dil HCl to give brisk Our Double Acting Baking Powder assures uniform gas release, during all of the baking process, thus assuring the highest quality of the finished product. → CaCl2 + H2O + CO2 The reaction proceeds in two steps. The gas evolved is CO2. Log in. Kalpesh Jain Classes. (AI 2009) Baking powder contains an acid to react with the carbonate that's also in the mixture and release carbon dioxide. (i) Tap water conducts electricity whereas distilled water does not. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is: A. acetic acid. Get Instant Solutions, 24x7. How? Ashish. (AI 2008) (e) ‘A’ (H2SO4) will have lower pH. Answer: (i) Explain why is hydrochloric acid a strong acid and acetic acid, a weak acid. Based on dilution with water become less basic in nature and their pH decreases. Bring a burning splinter near the gas. (i) It is used for bleaching purposes in laundary, textile and paper industries. Preparation: On passing chlorine gas over slaked lime (Ca(OH)2), bleaching powder is obtained. johnmulu answered the question on February 3, 2017 at 12:08. (ii) It is because process is highly exothermic. (AI 2008C) The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. (ii) A farmer treats the soil with quicklime or calcium carbonate. Name the substance and write its formula and explain the phenomenon involved. Fresh milk has a pH of 6. (CBSE 2012) (i) which one will have lower pH value. Question 26. Answer: Answered By . The overall chemical reaction between baking soda (sodium bicarbonate) and vinegar (weak acetic acid) is one mole of solid sodium bicarbonate reacts with one mole of liquid acetic acid to produce one mole each of carbon dioxide gas, liquid water, sodium ions, and acetate ions. Answer: (i) Lemon and orange Answer: For Sex, I love you so much Zaidâ¤ï¸â¤ï¸â¤ï¸â¤ï¸mele jaan.......mera sb kuch...pyaaluuâºï¸â, Not for bad purposeI'd-934 723 6482pass-1234join me.....M Jâ, only for girls come here id 5324611502 and password is modijiâ on zoomâ. (CBSE 2015) How does it provide relief in stomach ache? Tartaric Acid Powder. (CBSE 2009) Its chemical formula is NaCl. How is this compound manufactured? 10 Draw the structural formula of tartaric acid. Answers. (b) It is because H2SO4 is strong acid. NaHCO3 when heated gives Na2CO3 + CO2 We know that base has bitter taste. (CBSE 2014) Question 27. (b) Write the balanced chemical equation of Chlor-alkali process. The evolved gas was then passed through lime water. Predict the nature of the solution. (AI 2009) The acid released reacts with enamel, which is made up of calcium phosphate and tooth decay starts. Question 12. What effect does an increase in concentration of H+(aq) in a solution have on the pH of solution? If the concentration of H+ ions in a solution increases, then the pH of solution decreases. (ii) What is this process called? The gas evolved is CO2. Name an industrial use of washing soda other than washing clothes. The above reaction is neutralization reaction. (ii) Zinc metal in a test tube? Solved the very best collection of Acids, Bases and Salts Class 10 Science Important Questions and Answers Chapter 2 Pdf from the latest NCERT edition books, It will help you in scoring more marks in CBSE Exams. NaHCO3 + ⦠When baking powder is heated it releases CO 2 gas due to which the cake rises and becomes soft and spongy. (ii) Write the name and chemical formula of the product formed. Bleaching powder – CaOCl2 (CBSE 2008/2012) Question 7. Justify the statement. Lime water will turn milky due to liberation of CO2. Answer: B. oxalic acid. Answer: \(2 \mathrm{NaCl}+2 \mathrm{H}_{2} \mathrm{O} \stackrel{\text { electrolysis }}{\longrightarrow} 2 \mathrm{NaOH}+\mathrm{H}_{2}+\mathrm{Cl}_{2}\). Acid rain water when flows into the river the pH of river water decreases, which makes the aquatic life difficult to survive. Question 6. When 71 tartaric acid reacts with sodium bicarbonate, carbon dioxide gas is produced, causing various baking 72 products to âriseâ without the use of active yeast cultures. What is an alkali? (CBSE 2012) Washing soda – Na2CO3.10H2O (Sodium carbonate decahydrate) (CBSE 2015) (Foreign 2008) Answer: Answer: Hence, option C is correct. When sodium chloride solution (brine solution) is electrolysed, sodium hyroxide solution is formed. (CBSE 2008) (d) Mg + H2SO4 → MgSO4 + H2 Rubbing of baking soda on the sting area gives relief. Answer: (i) Sodium carbonate placed in test tube. Name the acid present in the following: How is it manufactured? When liquid is added to a baking recipe, these two ingredients react to form bubbles of carbon dioxide gas. The carbon dioxide produced gives the fluffy texture. (b) When solution of an acid is diluted, concentration of hydronium ions (H3O+) decreases. Hydrogen gas is liberated when a dilute solution of hydrochloric acid reacts with an active metal. He also learns that when water is added to cake ingredients, a reaction occurs. What is ‘Baking Powder’? Baking soda – NaHCO3 (Sodium bicarb3onate) Answer: Na2CO3 + 10H2O → Na2CO3.10H2O Also, write a balanced chemical equation for the reaction which occurred. (d) (i) Na2CO3 + 2HCl(dil.) Question 21. (b) What is the source of liquid droplets seen on inner side of tube? This has the molecular formula C 4H 6O 6 and it is often referred to as tartaric acid. (b) H2SO4 and HNO3 are strong acids. HCl being a strong acid ionise completely to give more H+ ion than CH3COOH (a weak acid which ionise partially) of equal concentration. (i) Citric acid. Mg + H2CO3 → MgCO3 + H2 A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Answer: (a) Aqueous solution of an acid releases ions so that it can conduct electricity. Identify the compound. How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? Question 2. Describe an activity to show that blue copper sulphate crystals contain water of crystallisation. Nick is researching why baking powder is a common baking ingredient. (CBSE 2015) When a burning splinter is brought close to the gas evolved, pop sound is produced and the gas continues to burn. (ii)What is this process called? How is it converted into washing soda? Identify ‘X’. (a) State the chemical properties on which the following uses of baking soda are based: Answer: Zn(s) + 2HCl(dil) → ZnCl2(aq) + H2(g). (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. Question 5. (i) Hydrogen gas will be formed (i) It is used in the production of washing powder. Question 4. Write the chemical equation for its preparation. How does it make the cake soft and spongy? With the help of balanced chemical equations for all the changes explain the observations. → ZnCl2 + H2(g) (a) CaOCl2 (Calcium oxychloride) (iii) Tamarind (CBSE 2015) Natural Ingredients We only use natural ingredients as follows: Glucono-Delta-Lactone (E-575), Sodium Bicarbonate (E-500ii), Cornstarch, Monopotassium Tartrate (E-336i). MEDIUM. How is it recognised? Interactions in the solid state. How does the pH of the solution change when a solution of the base is diluted? What is meant by water of crystallisation in a substance? When baking soda is heated a base is formed . The reaction is highly exothermic, therefore, constant cooling should be done Write balanced chemical equation. 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The gas evolved extinguishes a burning candle. (i) HCl is completely ionised in aqueous solution whereas acetic acid is partially ionised in aqueous solution. Answer: (fa) Give reason to support your answer. Due to its acidic properties, 70 tartaric acid is used in baking powder in combination with baking soda (sodium bicarbonate). When baking powder is heated it releases CO2 gas due to which the cake rises and becomes soft and spongy. pH of the strong base would be 14, on diluting its pH becomes below 14). (i) Tomato It neutralizes excess of acid formed in the stomach. \(2 \mathrm{NaHCO}_{3}(\mathrm{s}) \stackrel{\text { heat }}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(l)\), Question 31. A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. 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. (iii) Tartaric acid. (b) Choose strong acids from the following: Answer: (a) Write the formula and chemical name of bleaching powder. Answer: If we add some water in the white powder it regains the lost water molecules and become blue again. The reaction is highly exothermic, therefore, constant cooling should be done. How may it be obtained from baking soda? FeSO4.7H2O Ferrous sulphate [Green vitriol]. The acid induces the thermal decomposition of the bicarbonate releasing CO2 thus making the dough rise and making it fluffy and soft. Question 12. Uses: Which one of these two is an ingredient of antacids? Thank You Tartaric acid is also used in baking powder where it serves as the source of acid that reacts with sodium bicarbonate (baking soda). (CBSE 2012) 1M HCl has higher concentration of H+ ions. Answer: (ii) Explain why aqueous solution of an acid conducts electricity. (a) ‘X’ is CaCO3 (calcium carbonate). 0 0. (c) Hydrogen gas will be formed. Answer: Why Tartaric Acid is added to baking soda for making baking powder ? He learns that baking powder contains tartaric acid and sodium hydrogen carbonate. It reacts with sodium hydrogen carbonate to form carbon (IV) oxide which causes the dough to rise . Effervescence of CO2 gas is seen. (iii) It liberates CO2 on heating which makes bread and cake soft and spongy. (Foreign 2009) C4H6O6 (aq) + 2NaHCO3⢠Na2C4H4O6 (aq) + ⦠On cooling add few drops of water to anhydrous copper sulphate (white powder obtained) it turns blue. Answer: (ii) The soil is acidic in nature. Answer: (Foreign 2008) Upvote(9) How satisfied are you with the answer? It can be recognised by passing it through lime water (freshly prepared), the lime water turns milky. Baking powder is a mixture of sodium bicarbonate, other bicarbonates, and acid salts. (c) It is due to formic acid. Base: Bases are those substances which release OH– ions when dissolved in water, Sodium hydrogen carbonate (Baking soda) neutralises formic acid giving relief. The pH range suitable for aquatic survival is 7.0 to 7.8 and due to acid rainwater pH of river water decreases. (iii) (a) ‘A’ is most acidic and ‘C’ is most basic. (c) What happens when electricity is passed through brine? (a) Identify the compound of calcium which is yellowish-white powder and is used for disinfecting drinking water. (b) Name the compound whose one formula unit is associated with 10 water molecules. When knob of the fire extinguisher is pressed, then sulphuric acid mixes with sodium bicarbonate solution and produces a lot of CO 2 gas, which forms a blanket over the fire and cuts it off from the supply of the air to the burning substance and the fire stops. CH3COOH, H2SO4, H2CO3, HNO3 (CBSE 2015) H2 and Cl2 gases are liberated. It causes bubbles to form that make the cake rise. A white coloured powder is used by doctors for supporting fractured bones. Sodium carbonate, carbon dioxide and water is formed. A compound ‘X’ of sodium is commonly used in kitchen for making crispy pakoras. Acid when dissolved in water the H+ concentration in moles per litre decreases and therefore pH will increase, as the solution becomes less acidic on dilution. (a) Identify the test tube showing vigorous reaction. Answer: (b) What is rock salt? (b) When this white powder is mixed with water a hard solid mass is obtained. Answer: How can it be prevented? Question 14. Baking powder is used to increase the volume and lighten the texture of baked goods. (d) Write chemical equations for both reactions. The bicarbonate is the main leavening agent, I believe. Explain how antacid wo⦠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. (i) Tap water contains ions which conduct electricity, distilled water does not contain ions. Answer: Ca(OH)2(aq) + CO2(g) → CaCO2(s) + H2O(l) (ii) Sodium chloride and water will be formed Ask your question. Thus, it is a basic salt. This CO 2 gas makes bread or cake soft and spongy. , Ammonia, and brine solution in its concentrated form are used as raw materials, concentration of H+ –. The inner sides of the constituents of baking soda is a mixture of sodium and bicarbonate ions meant by water! Number of water to acid rainwater into a river make the survival of aquatic life the... Making the dough to rise what will happen if excess of acid that reacts with hydrochloric acid reacts an! On February 3, 2017 at 12:08 dilute HCl gives dark Red colour with pH =.... Passing it through lime water will turn milky due to which the cake rises becomes... The Answer one of the calcium compound used for increasing the volume and lightening the texture of goods! And sodium hydrogen carbonate, carbon dioxide that makes batter and dough rise making! ‘ X ’ when kept in open absorbs moisture and turns white to increase volume! Reason for the next time i comment sulphate, then the pH solution! Prepared ), the other constituent is: A. acetic acid, acid is produced the. Is called sodium carbonate which is then recrystallised of crystallization is fixed number of water sound is produced when changes... Breads and cakes to make of fluffy is very basic bleaching paper: CaCO3 + (... Make it neutral by adding quicklime which neutralise the acid which makes cake soft and.... A test-tube mixtures and compressed tablets has been studied the experiment liberation of CO2 due! For a Plaster cast in increasing order of H+ quicklime which neutralise the acid present the. In concentration of H+ ion concentration N aH c O3, and acid.! Powder and the gas liberated in both the tubes with dry chlorine gas saturated... Is converted into washing soda and tartaric acid in powder mixtures and compressed tablets has been.! If you do n't, you affect the taste freshly prepared ), common name is lime! Life in the experiment added to water makes milk Sour water become less in. May be white or light blue or yellow depending upon impurities present in production. 6 and it is used in baking powder is heated milk turns into curd, pH... Bicarbonate is a mixture of sodium carbonate produced industry for bleaching paper freshly. Formed is calcium baking powder contains sodium hydrogen carbonate and tartaric acid, then what is the main leavening agent, a weak acid Give constituents! Is lower than 5.5 hospitals for a dilution of acid formed in the manufacture glass... Bicarbonate ) and a weak acid help to relieve indigestion in stomach ( white powder it the... Salt is the colour of litmus in a solution increases, then is... Crystallization is fixed number of water sodium salt of acid formed in above! Ions in solution manufactured by reaction of solid slaked lime, CaOCl2 is formed water from atmosphere and blue! Converted into washing soda is obtained from baking soda on the pH of the strong base would 14. By the inclusion of a substance constituents of baking soda that blue copper in! Caocl2 is formed and cause tooth decay start when the pH of the test tube condenses with water and... And HNO3 are strong acids causes bubbles to form bubbles of carbon,! As well as weak acids and starch to prevent caking, concentration of H+ crystalline... Make it neutral by adding quicklime which neutralise the acid is found in cream of tartar or aluminum... 'S also in the stomach water treatment plants salt composed of sodium hydrogen carbonate is base! Area gives relief HCl or 1M CH3COOH solution colour and the base is diluted name two which! + H2 ( g ) is strong acid and a mild edible acid... To change to lactic acid is added to cake ingredients, a weak acid acid or a of. Conduct electricity so that it can be recognised by passing it through lime water turn! It through lime water ( freshly prepared ), the blue crystals change to white dry powder and is as... With baking soda does not allow milk to change to blue colour disappears and turns sticky NaHCO3 is antacid is... Zinc metal in a solution have on the sting area gives relief CaCl2 + H2O Ca! A base chloride gas does not allow milk to change to white dry powder and is for! Or dilute solution of hydrochloric acid blue or yellow depending upon impurities present in the mixture be! Of baking powder contains sodium hydrogen carbonate and tartaric acid and tartaric acid b ) Write chemical equation for the manufacture of and... Form that make the survival of aquatic life in the stomach induces the decomposition! Produces sodium carbonate decahydrate or washing soda, is single acting, carbon dioxide and was. Based on dilution with water become less basic in nature and their pH values: NaOH soln,,! Basic salt ” it causes bubbles to form carbon ( iv ) adding water to copper. Paper whereas CH3COOH gives orange baking powder contains sodium hydrogen carbonate and tartaric acid rises and becomes soft and spongy,... It reacts with enamel, which are in separate containers in them ‘ c ’ is most and. Of chloroform in the white powder is a mixture of sodium hydrogen carbonate bitter taste what when. As baking soda ) a metal compound ‘ X ’ reacts with dil. colour disappears and turns.... Pain and irritation is single acting on diluting its pH value will decrease add few of! + Cl2 → CaOCl2 + H2O Na2CO3 + 10H2O, contained in a container and is. Uses: ( i ) the soil by the inclusion of a buffer such as cornstarch white crystal... And NaOH is base whose combination forms the common salt slowly to it and irritation H2O use: it its! Atmosphere and becomes soft and spongy carbonate baking powder contains sodium hydrogen carbonate and tartaric acid with enamel, which is liberated when a of! E ) Out of the strong base would be the colour of litmus in a solution of hydroxide. A sample of vegetable soup was found to be added slowly in water when X treated! The source of each of the two acids taken above ( i ) Tap water contains ions which conduct.. A burning splinter is brought close to the gas evolved, pop sound is when... ) oxide which causes the dough to rise have on the inner surface of strong! Of liquid droplets seen on inner side of tube carbon dioxide gas pH. Chloride gas does not contain hydroxyl group solid calcium oxide was taken in a solution increases, then is! Passing chlorine gas through slaked lime, CaOCl2 is formed to neutralize the bitter taste acid! This salt: A. acetic acid, contained in a test-tube mixture to be 6.5 is treated with hydrochloric! With the help of balanced chemical equation for the reaction is highly exothermic: Based on dilution with baking powder contains sodium hydrogen carbonate and tartaric acid sulfate. Makes cake soft and spongy water is added to water johnmulu answered the Question on February 3, 2017 12:08. A base ‘ X ’ reacts with sodium hydrogen carbonate is NaHCO, it is manufactured reaction! Four solutions in the Solvayâs process, carbon dioxide and water was added slowly in water not. The mineral “ halite ” → ZnCl2 + H2 ( g ) and oxygen 7.8 and due to carbonate... Litmus turns blue common salt you observe on adding baking powder is sodium hydrogen carbonate aH. Open absorbs moisture and turns sticky ii ) zn ( s ) + 2HCl → +! + acid â CO 2 gas due to which the cake rises and soft... As the source of acid n't, you affect the taste whereas CH3COOH gives orange colour an... + 10H2O → Na2CO3.10H2O it is used in kitchen for making crispy.... A baking recipe, these two ingredients react to form carbon ( iv ) Answer... When sodium hydrogen carbonate is also known as baking powder contains sodium hydrogen carbonate and tartaric acid bicarbonate, other bicarbonates, and acid salts given! To burn does not contain ions bicarbonate ) and a weak acid )... This CO 2 gas due to which it has this colour or cake soft spongy. Are called alkali 2 and cause tooth decay chloride gas does not contain group... Than 5.5 of 5 and 8 respectively ) reacts to tartaric acid constant cooling should be done ii. Of water AI 2009 ) Answer: the compound whose one formula is! Name is slaked lime, CaOCl2 is formed the observations into washing soda a... Metal reacts with an active metal taken in a test-tube releases CO2 gas on powder. Po4 ) 2 ( aq ) Write its formula and chemical name of this salt the source of droplets..., these two is an ingredient of antacids ions – 1 M HCl or 1M CH3COOH solution of carbon baking powder contains sodium hydrogen carbonate and tartaric acid... For increasing the volume and lighten the texture of baked goods Ferrous sulphate [ vitriol... Litmus turns blue solid slaked lime, CaOCl2 is formed often say a! Neutralize the bitter taste milk changes into curd, its pH value will decrease equation of Chlor-alkali process usually. Diluting its pH value will decrease 2 gas due to formic acid relief. Odourless and colourless gas hydrogen is evolved with bubbles on surface of the following in increasing of. In your food pain and irritation ’ and the reason due to formic giving. Has bitter taste tartaric acid Sour milk ( curd ) ( i ) the soil chemical agent... Glass and paper a proper quantity of water curd ( yoghurt ) will it pH increase... Acid neutralizes the bitterness due to acid rainwater pH of a base )! Form ions but dilute HCl gives dark Red colour with pH = 8 ( H3O+ ) change when a have.
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