Question

lactic acidosis has a pKa of 3.86. At pH 3.60, the % of lattice acid that remain undissociated is

Answer 1

Ans.

Given that,

pKa = 3.86

pH = 3.60

Henderson Hasselbalch equation is given by

Therefore,

SInce lactic acid is a monoacid, the no. of mol of H⁺ and that of the conjugate base A^- will be the same. So, the concentration of H⁺ and A^- will be the same.

Therefore,

The percentage of dissociated acid is given by

%

So, the percentage of undissociated acid is given by

%

Therefore, the percentage of undissociated lactic acid = 45%