Tentukan PH dari larutan CH3COOH 0,4 M

Ka CH3COOH = 1,8 x 10^-5

PH = - log √Ka x [M]
= - log √ 1,8 x 10^-5 x 4 x 10^-1
= - log √720 x 10^-8
= - log 10^-4 x 12√5
= 4 - log 12√5