Question

Q.120 If a buffer solution has 0.1 molar concentration of benzoic acid and 0.01 molar
concentration of sodium benzoate, then what is the pKa value of buffer solution when its PH is 3

Answer 1

Answer:

3

Explanation:

Using Handerson equation

PH = pKa + log [CH3COO-]/[CH3COOH]

PH = PKa + log [0.1/ 0.01]

PH = pKa + log10

pKa = pH = 3