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= akar 1,8 x 10^-5 x 0,1
= akar 0,18 x 10^-5
= akar 1,8 x 10^-6
= 1,34 x 10^-3
pOH = -log [OH-]
= -log 1,34 x 10^-3
= 3 - log 1,34
pH = 14-(3-log 1,34)
= 14-3+log 1,34
= 11+log 1,34
= 11+1,13
= 12.13