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You have to prepare a pH 5.00 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN.

Which solutions would you use?

HCOOH
HCOONa
CH3COOH
CH3COONa
HCN
NaCN

2 answers

Look up Ka values for HCOOH, CH3COOH, HCN and convert to pKa values. Good buffers are made with pKa values close to the pH needed.

CH3COOH, CH3COONa

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