Buffers are solution that contains acids, bases, and salts. The concentration of formic acid is more than potassium formate.
Henderson-Hasselbalch equation is the relation of the pH with the dissociation constant of the acid. The equation can be given as,
pH = pKa + log [A⁻] ÷ [HA]
The hydrogen ion concentration of the potassium formate can be calculated from pH as:
pH = - log [H⁺]
[H⁺] = 10⁻⁴°⁸⁵
= 0.0000141
The concentration of the formic acid from the potassium formate is calculated as:
pH - pKa = log [A⁻] [HA]
log [A⁻] = (4.85 - 3.7447) × 0.0000141
[A⁻] = 1.000035
Therefore, formic acid is present more in concentration than potassium formate.
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