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 NaOH and 0.10 M HNO₃ D)a solution that is 0.10 M HNO₃ and 0.10 M KNO₃ E)a solution that is 0.10 M HCN and 0.10 M NaCl

Question

Quizplus · Accepted Answer

A buffer system needs to have a weak acid and its corresponding conjugate base, or a weak base and its corresponding conjugate acid. In choice B, HCN is a weak acid and LiCN is its corresponding conjugate base, making it a good buffer system. The other choices either do not have both a weak acid and its corresponding conjugate base or have a strong acid and its corresponding salt, which does not make a good buffer system.

Which of the Following Solutions Is a Good Buffer System