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poh = 3
[OH-] = 1.10-3
Ca(OH)2 = [Ca2+] [2OH-]
s 2s
[OH-] = 2s
1.10-3 = 2s
s = 1.10-3 dibagi 2
s = 0,5 .10-3
s = 5.10-4
kalau gak salah cra.e gitu