# Buffer Sensitivity

Chemistry Level 4

An acid-base buffer solution contains $$0.2\text{ mol/L}$$ of $$\text{A}^-$$ and $$0.2\text{ mol/L}$$ of $$\ce{HA}$$. A small amount of strong acid is added. By how many units with the pH of the buffer decrease, per $$\text{ mol/L}$$ of added acid?

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