Answer to Question #171960 in Math for Irish

Question

Compute for the pH and % ionization of a 0.75% v/v of a 150 ml diluted formic acid solution with a SG of 1.22 g/ml. kaformic acid = 1.77x10-4 

Answer 1

Conc in mol/dm³ = 1.22 g/mL x 1,000mL x 0.75 %v/v ÷ 46.03g/mol = 0.20mol/L

pH = -log [H⁺]

= -log [0.20]

= 0.70

%ionization = [H⁺] /[HA^-] x 100

= 0.7 /0.2 x 100

= 3.5%