Question

What is the optimum ph of a sodium formate/formic acid buffer? (for formic acid, ka = 1. 7 × 10–4. )

Answer 1

The optimum pH of formic acid - formate buffer is 3.75

What is pH?

• pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
• pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

What is Buffer ?

A substance or a solution which resists any changes in pH, when acid or alkali is added to it.

pH = pKa + log[base] / [acid]

Considering equimolar concentration of acid and base

pH = 3.75 + log(x)/(x)

pH = 3.75 + log (1)

pH = 3.75 + 0

pH = 3.75

Hence,

The optimum pH of formic acid - formate buffer is 3.75

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