Exploring Acids and Bases
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Exploring Acids and Bases
Sample questions with model answers
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How can natural indicators be prepared? Explain by giving an example.
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Natural indicators can be prepared from plants; for example, red rose extract is made by washing, crushing, and filtering rose petals in hot water.
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Three liquids are given to you. One is vinegar, another is a baking soda solution, and the third is a sugar solution. Can you identify them only using turmeric paper? Explain?
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Baking soda turns turmeric red, vinegar has no effect but has a suffocating smell, and sugar solution is odourless and has no effect.
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Manya is blindfolded. She is given two unknown solutions to test and determine whether they are acidic or basic. Which indicator should Manya use to test the solution and why?
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Manya should use an olfactory indicator like onion or vanilla extract.
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Grape juice was mixed with red rose extract. The mixture got a tint of red rose colour. What will happen if baking soda is added to this mixture? Justify the answer.
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The mixture becomes neutral when baking soda is added.
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