You have 50 ml of a complex mixture of weak acids that contains some HF (pKa = 3.18) and some HCN (pKa = 9.21). Which is larger, [F-]/[HF] or [CN-]/[HCN]?

is larger

Explanation:

, where is the acid dissociation constant.

For a monoprotic acid e.g. HA, and

So, clearly, higher the value , lower will the the

In this mixture, at equilibrium, will be constant.

of HF is grater than of HCN

Hence,

So, is larger

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