Buffer pH: Henderson–Hasselbalch

Change the amounts of weak acid and its salt to see the buffer pH and why it barely moves.

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Questions students ask

How does a buffer resist pH change?

Added acid is taken up by the salt's anions and added alkali by the weak acid, so the ratio of acid to salt, and the pH, change very little.

What formula does it use?

pH = pKa + log₁₀([salt]/[acid]).

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