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A buffer solution is prepared by mixing 78.9 mL of 0.0419 M acetic acid with 35.9...

A buffer solution is prepared by mixing 78.9 mL of 0.0419 M acetic acid with 35.9 mL of 0.0317 M sodium acetate. A table of pKa values can be found here. 1. Calculate the pH (to two decimal places) of this solution. Assume the 5% approximation is valid and that the volumes are additive. 2. Calculate the pH (to two decimal places) of the buffer solution after the addition of 1.88 g of sodium acetate (NaCH3COO) to the buffer solution above. Assume 5% approximation is valid and that the volume of solution does not change.

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Answer #1

1.

For acetic acid, pKa is 4.74.

2.

1.88 g of sodium acetate is added. The molar mass of sodium acetate is 82 g/mol.

The number of moles of sodium acetate added

Number of moles of sodium acetate present initially

Total number of moles of sodium acetate

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