alleryA BUFFER solution is best described as:
AA weak acid + its salt (or weak base + its salt)
BA strong acid + strong base mixed together
CA very dilute strong acid
DAn acidic solution at extreme pH
Answer & Solution
Correct answer: A. A weak acid + its salt (or weak base + its salt)
Buffer = weak acid + conjugate base (its salt) OR weak base + its conjugate acid salt.
The pair resists pH changes when small acid or base is added.
**Henderson equation:** pH = pKa + log([salt]/[acid]).
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