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Jika pH = 8 maka OH- = 10^-6
OH- = Kb x n lemah / n garam
N garam = Kb x n lemah / OH-
N garam = 7.5 mmol
Dlm stp n = V / 22.4 liter
V = n x 22.4
V = 0.0075 mol x 22.4 liter = 168 mL