Which of the following solutions is a good buffer system? A) a solution that is 0.10 M NaCl and 0.10 M HCl B) a solution that is 0.10 M HCN and 0.10 M LiCN C) a solution that is 0.10 M LiOH and 0.10 M HNO₃ D) a solution that is 0.10 M HNO₃ and 0.10 M NaNO₃ E) a solution that is 0.10 M HCN and 0.10 M NaBr

Question

Quizplus · Accepted Answer

A good buffer system should have a weak acid and its corresponding conjugate base or a weak base and its corresponding conjugate acid. In option B, HCN is a weak acid and LiCN is its corresponding conjugate base, making it a good buffer system. Option A has a strong acid and its salt, making it ineffective as a buffer. Option C has a strong base and its salt, also making it ineffective as a buffer. Option D has a weak acid and its corresponding salt, but the salt is not the conjugate base, so it is not an ideal buffer system. Option E has a weak acid and a salt, but the salt (NaBr) is not its corresponding conjugate base, so it is not an effective buffer system.

Which of the Following Solutions Is a Good Buffer System