Which of the following describes a solution that contains a buffer? A. Acetic acid is added to the solution, and the pH of the solution becomes lower. B. Distilled water is added to the solution, and the pH of the solution does not change. C. Formic acid is added to the solution, and the pH of the solution becomes higher. D. Sodium hydroxide, a base, is added to the solution, but the pH of the solution does not change.

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Biology

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20 February, 19:40

Which of the following describes a solution that contains a buffer? A. Acetic acid is added to the solution, and the pH of the solution becomes lower. B. Distilled water is added to the solution, and the pH of the solution does not change. C. Formic acid is added to the solution, and the pH of the solution becomes higher. D. Sodium hydroxide, a base, is added to the solution, but the pH of the solution does not change.

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Quinn · Answer 1

D is the correct answer. Sodium hydroxide, a base, is added to the solution, but the pH of the solution does not change. When we talk about a buffer solution it is about resistance in change of pH when small quantity of alkali or acid added to it. Sodium hydroxide is a weak base so adding it to pH less than 7 is more likely to resist.