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pOH = 3 - log 2
[OH-] = 2 x 10^-3
[OH-] = akar(kb x M)
2 x 10^-3 = akar(kb x 0,2)
4 x 10^-6 = kb x 0,2
kb = 4 x 10^-6 / 0,2
kb = 2 x 10^-5