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In your calculations also provide the equation and calculations needed to prepare 100mL of an acetate...

In your calculations also provide the equation and calculations needed to prepare 100mL of an acetate buffer solution at pH 5.5? (Must use grams of sodium acetate and mL of galacial acetic acid. Water to dilute.)

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Answer #1

The pKa of acetic acid is 4.75.

The buffer equation is

HC2H3O2(aq) ----------> H+(aq) + C2H3O2-(aq)

Use the Henderson-Hasslebach equation to calculate the pH of the buffer as

pH = pKa + log [C2H3O2-]/[HC2H3O2]

====> 5.5 = 4.75 + log [C2H3O2-]/[HC2H3O2]

====> 0.75 = log [C2H3O2-]/[HC2H3O2]

====> [C2H3O2-]/[HC2H3O2] = antilog (0.75) = 5.6234

====> [C2H3O2-] = 5.6234*[HC2H3O2] ……(1)

The Henderson-Hasslebach equation gives the ratio of the concentrations of acetate and acetic acid needed in the buffer. However, the total acetate concentration is not give. The total acetate concentration is required to find out the individual concentrations. Kindly supply the same information.

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