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15 June, 08:40

Which of the following solutions is a buffer?

Check all that apply.

A. a solution made by mixing 100 mL of 0.100 M CH3COOH and 500 mL of 0.100 M NaOH

B. a solution made by mixing 100 mL of 0.100 M CH3COOK and 50 mL of 0.100 M KCl

C. a solution made by mixing 100 mL of 0.100 M CH3COOH and 50 mL of 0.100 M HCl

D. a solution made by mixing 100 mL of 0.100 M CH3COOH and 50 mL of 0.100 M NaOH

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Answers (1)
  1. 15 June, 08:48
    0
    D. a solution made by mixing 100 mL of 0.100 M CH3COOH and 50 mL of 0.100 M NaOH

    Explanation:

    Buffer solutions are the solutions which can resist the change in the pH up to some extent.

    The pH of a buffer solution can be measured by the equation known as Henderson-Hasselbalch equation.

    pH=pKa+log[base]/[acid]

    Buffer solutions are the solutions of either weak acid and conjugate base of it or weak base and conjugate acid of it.

    Hence, a weak acid and a strong base can result in weak acid and it's conjugate and can acts as a buffer.

    Option D is correct.
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