# Given aqueous solutions of 0.1 M weak acetic acid (CH3COOH, pKa=4.72) and 0.1 M sodium acetate (NaC2H3O2), calculate the volumes of acid and acetate to be mixed, in order to make 50mL of a buffer solution with pH=5.2.

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Asked Dec 6, 2019
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Given aqueous solutions of 0.1 M weak acetic acid (CH3COOH, pKa=4.72) and 0.1 M sodium acetate (NaC2H3O2), calculate the volumes of acid and acetate to be mixed, in order to make 50mL of a buffer solution with pH=5.2.

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Step 1

Consider the volume of acetic acid in the final solution be x L and the volume of sodium acetate in the final solution be y L. The number of moles of both the species in their starting solutions can be calculated using equation (1),

Step 2

The volume of the final buffer solution is 50 mL ( = 0.050 L).

The number of moles of acetic acid and sodium acetate in the final buffer solution can be calculated using equation (1),

Step 3

The relation between pH and pKa of a weak acid is given by the Hende...

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