Which one of the following is a buffer solution A) 0.40 M HCN and 0.10 KCN B) 0.20 M CH₃COOH C) 1.0 M HNO₃ and 1.0 M NaNO₃ D) 0.10 M KCN E) 0.50 M HCl and 0.10 NaCl

Question

Quizplus · Accepted Answer

A buffer solution contains a weak acid and its conjugate base or a weak base and its conjugate acid. In option A, HCN is a weak acid and KCN is its conjugate base, so it is a buffer solution. Option B is a single compound and therefore cannot be a buffer solution. Option C contains strong acid and strong base, so it is not a buffer solution. Option D contains only KCN which is a conjugate base but no weak acid, so it is not a buffer solution. Option E contains HCl, which is a strong acid and no weak base, so it is not a buffer solution.

Which One of the Following Is a Buffer Solution