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## Homework Statement

>For a solution that contains 0.10 M HCN and 0.10 M NaCN, which statement is false?

A) This is an example of the common ion effect.

B) The [H+] is larger than it would be if only the HCN was in solution.

C) the [H+] is equal to $K_a$

D) Addition of more NaCN will shift equilibrium to the left

E) Addition of NaOH will increase [CN^-] and decrease [HCN]

## Homework Equations

## The Attempt at a Solution

I was actually stumped when I first saw the question. I tried wirintg the equation HCN + NaOH --> NaCN + H2O, and made an ice table so to get (0.1 + x)x/(0.1-x), but I wasn't sure where to go after that.