When baking powder is mixed w… Sodium hydrogen carbonate on heating gives C02 which makes cake soft and fluffy. Why does tooth decay start when the pH of mouth is lower than 5.5? (b) (i) Name one antacid. Tartaric acid neutralizes the bitterness due to sodium carbonate produced. Which gas is generally liberated when a dilute solution of hydrochloric acid reacts with an active metal? Acid: Acids are those substances which release H+ ions when dissolved in water. (a) A will show vigorous reaction. (a) Identify the most acidic and most basic solutions. (b) It is because H2SO4 is strong acid. The compound is calcium sulphate hemihydrate, Plaster of Paris CaSO4. Write its formula and chemical name of this salt. (CBSE 2015) (a) What is the colour of copper sulphate crystals (iv) Adding water to acid is highly exothermic. Answer: pH of the strong base would be 14, on diluting its pH becomes below 14). CaCO3 + 2HCl → CaCl2 + H2O + CO2, Question 34. How may it be obtained from baking soda? (AI 2009) (i) Tomato (i) The acid is to be added slowly in water to prevent the mixture to be splashed. CH3COOH, H2SO4, H2CO3, HNO3       (CBSE 2015) (a) (i) Colour of copper sulphate crystals before heating is blue. 10 Draw the structural formula of tartaric acid. 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 … I: Interactions of sodium bicarbonate and tartaric acid under compressed conditions. Ca(OH)2 + CO2 → CaCO3. (CBSE 2008C) 4 years ago. HCl gives dark red colour with pH paper whereas CH3COOH gives orange colour. Question 29. (CBSE 2013) Natural Ingredients We only use natural ingredients as follows: Glucono-Delta-Lactone (E-575), Sodium Bicarbonate (E-500ii), Cornstarch, Monopotassium Tartrate (E-336i). Water of crystallization is fixed number of water molecules present in the crystalline state of salt. Write the chemical equation for its preparation. 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. Answer: Write the chemical formula of washing soda and baking soda. The reaction that occurs between sodium bicarbonate (NaHCO 3) and cream of tartar (KHC 4 H 4 O 6) is: NaHCO 3 + KHC 4 H 4 O 6 → KNaC 4 H 4 O 6 + H 2 O + CO 2. Answer: (Foreign 2009) Give an example, Answer: This will help us to improve better. (i) Tap water contains ions which conduct electricity, distilled water does not contain ions. Answer: Answer: Write chemical equation. (iii) Crushed egg shells. Answer: One acid that may be in baking powder is 2,3-dihydroxybutanedioic acid. The gas evolved is CO2. Answer: Chemical formula → NaHCO3 Answer. (c) State the change in colour of pH paper on dipping in solution C and D.      (CBSE 2012) (b) What is rock salt? When a burning splinter is brought close to the gas evolved, pop sound is produced and the gas continues to burn. Get Instant Solutions, 24x7. 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. What happens chemically when quick lime is added to water? (iii) Tartaric acid. Answer: Answer: (Foreign 2008) During cooking → It decomposes to sodium carbonate, carbon dioxide and water. (ii) The process is called dilution. How can it be verified? (Foreign 2009) (i) It is used for bleaching purposes in laundary, textile and paper industries. (b) How is tooth decay related to pH? (CBSE 2006) (ii) after heating? Lime water will turn milky due to liberation of CO2. When baking powder is heated it releases CO 2 gas due to which the cake rises and becomes soft and spongy. Answer: Baking soda: The primary use of sodium bicarbonate where it is used as baking soda. Baking powder. Baking powder is used to increase the volume and lighten the texture of baked goods. (CBSE 2012) Upvote(9) How satisfied are you with the answer? This is chlor-alkali process. Sodium hydrogen carbonate reacts with the weak acid, releasing the carbon dioxide that makes batter and dough rise. When sodium chloride solution (brine solution) is electrolysed, sodium hyroxide solution is formed. Answer: Answer: Answer: H2 and Cl2 gases are liberated. How does the pH of the solution change when a solution of the base is diluted? Fresh milk has a pH of 6. CaCO3 + H2SO4 (dil.) Its formula is NaCl (Sodium chloride). 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. (ii) Tomatoes and Guava. (i) Oxalic acid 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) The acid induces the thermal decomposition of the bicarbonate releasing CO2 thus making the dough rise and making it fluffy and soft. (ii) Explain why aqueous solution of an acid conducts electricity. Google Meet , only girls Question 14. Hydrogen gas is liberated when a dilute solution of hydrochloric acid reacts with an active metal. It is manufactured by reaction of solid slaked lime with dry chlorine gas. Acid containing recipes often say add a little of extra bicarbonate. johnmulu answered the question on February 3, 2017 at 12:08. Baking soda on heating gives sodium carbonate which on crystallisation forms washing soda Sodium hydrogen carbonate and tartaric acid. (b) How is washing soda is obtained from baking soda? Question 17. Answer: (i) State the method that should be followed with reason. 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. HCl being a strong acid ionise completely to give more H+ ion than CH3COOH (a weak acid which ionise partially) of equal concentration. Ca(OH)2(aq) + CO2(g) → CaCO2(s) + H2O(l) The water molecules associated with a crystalline substance is called ‘water of crystallisation’. Describe an activity to show that blue copper sulphate crystals contain water of crystallisation. The compound is also formed by chlor-alkali process. This has the molecular formula C 4H 6O 6 and it is often referred to as tartaric acid. This is because lactic acid is produced when milk changes into curd. A is basic ‘B’ is acidic ‘C’ is natural and ‘D’ is strongly acidic. Question 16. He also learns that when water is added to cake ingredients, a reaction occurs. 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