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You want to make an acetic acid buffer in which the pH = pKa of acetic acid = 4.74. If you combine equal volumes of the following solutions, which combinations will result in the desired buffer?

Why are the answers are 0.20 M CH3CO2H + 0.10 M NaOH and 0.20 M Na(CH3CO2) + 0.10 M HCl

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