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m x y
b y y y
s x - y - y
pH = 9 ⇒ pOH = 5 ; OH^- = 10^-5
OH^- = Kb × (mol basa ÷ mol garam)
10^-5 = 10^-5 × ((x - y) ÷ y)
y = x - y
x = 2y
(x ÷ y) = ( 2 ÷ 1)
maka perbandingan volume NH3 dan HCl = 2 : 1