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=2.10pangkat -2
Ca+2OH
=2.10pangkat -2 + 2(2.10pangkat -2)
=2.10pangkat -2 + 4.10pangkat-2
[OH-] = 4.10pangkat -2
pOH = 2+log4
pH = 14 - 2+log4
pH = 12 - log 4