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pH = 9. pOH = 5. OH- = 10^-5
OH- = akar(Kw/Ka x M)
10^-5 = akar(10^-14/2x10^-5 x M)
10^-10 = 5 x 10^-10 x M
M = 0.2
Lalu pake pengenceran. Saat 10 mL kan M nya 0.2. Saat 500 mL berapa
10 x 0.2 = 500 x M2
M2 = 0.004