Which one of the following is a buffer solution

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Reference no: EM13171906

Which one of the following is a buffer solution?

A. 0.40 M HCN and 0.30 KCN
B. 0.20 M CH3COOH
C. Pure water
D. 0.0005 M H2CO3
E. 0.10 NaCl

Reference no: EM13171906

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