Neetu has two test tubes containing dilute hydrochloric acid and dilutesodium hydroxide solution, but they are not labeled.Adding which of the following solutions to the test tubes will help hervisually identify the acidic and basic solution?(a) only vinegar(b) only baking soda(c) only sodium chloride(d) either vinegar or sodium chloride
Question
Neetu has two test tubes containing dilute hydrochloric acid and dilutesodium hydroxide solution, but they are not labeled.Adding which of the following solutions to the test tubes will help hervisually identify the acidic and basic solution?(a) only vinegar(b) only baking soda(c) only sodium chloride(d) either vinegar or sodium chloride
Solution
The correct answer is (b) only baking soda. Here's why:
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Vinegar is a weak acid and will not react significantly with either hydrochloric acid or sodium hydroxide. Sodium chloride is a neutral salt and will also not react with either solution.
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Baking soda, on the other hand, is a basic compound. When added to an acid, it will react to produce carbon dioxide gas. This will cause the solution to fizz or bubble.
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Therefore, if Neetu adds baking soda to each test tube, the one that fizzes is the hydrochloric acid (the acidic solution), and the one that does not react is the sodium hydroxide (the basic solution).
So, by adding baking soda, Neetu can visually identify which solution is acidic and which is basic.
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