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Which one of the following pairs of solution is not an acidic buffer?

1. HClO4 and NaClO4
2. CH3COOH and CH3COONa
3. H2CO3 and Na2CO3
4. H3PO4 and Na3PO4

Correct answer: HClO4 and NaClO4

Solution

An acidic buffer consists of a weak acid and its salt with a strong base. HClO4 is a strong acid, so the pair HClO4 and NaClO4 cannot form a buffer.

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