bantu jawab pliss terimakasih

OH- = √ Kw / Ka x Mg
OH- = √ 10^-14 / 10^-5 x 0.1
OH- = √ 10^-9 x 10^-1
OH- = √ 10^-10
OH- = 10^5
pOH = - log OH-
pOH = 5

pH = pKw - pOH
pH = 14 - 5
pH = 9