Question

Derajat ionisasi larutan CH3COOH yang memiliki pH 3 adalah... (ka =10^-5)
a. 1%
b. 5%
c. 10%
d. 15%
e. 20%

Answer 1

PH = 3 maka H^+ = 10^-3

H^+ = √ Ka × M
10^-3 = √ 10^-5 × M
10^-6 = 10^-5 × M
   M = 10^-1

H^+ = α × M
10^-3 = α × 10^-1
     α  = 10^-2 ≈ 0,01 × 100% = 1%