# Solving for pH

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I have .20M of a solution NaCN. Ka for HCN = 4.0 x10 10. How do I solve for pH?

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#### Solution Preview

For these questions you must learn the general formula for a weak acid (and weak bases, just a little adjustment).

Ka = [H+][A-]/ [HA] which is true for any and all weak acids because...

HA --> H+ + A- and any K ...

#### Solution Summary

This solution is provided in 258 words and uses the formula for a weak acid/base to find pH.

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