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You have to prepare a pH 3.65 buffer, and you have the following 0.10M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa CH3

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correct option: A) HCOOH and D) HCOONa

The pKa values of formic acid is 3.73 which is closest to 3.65.

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