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[OH-] = 1,58x10^-5
pOH = 5-log 1,58
pH = 9+log 1,58
= √ 4× 10^ 6 × 0.1
= √ 0.4 × 10^6
= √ 4× 10^7
= 2 × 10^7/2
pH. = - log [H+]
= - log 2× 10^ 7/2
= 7/2 - log 2
= 3.5 - log 2
= 3.5 - log 2 berapa