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M: a
R; -x +x +x
S: a-x x x
a-x + x + x = 1 atm
⇔ a + x = 1
⇔ a = 1-x
Kp = x.x/(a-x)²
= x²/(1-x-x)²
1/4 = x²/(1-2x)²
(1-2x)² =4x²
1-4x + 4x² = 4x²
1-4x = 0
x = 1/4
zat mula-mula,a = 1-x = 1-1/4 = 3/4 atm
zat terurai, x = 1/4 atm
derajat ionisasi,α = zat terurai/ zat mula-mula
= 1/4 / 3/4 =1/4x4/3 = 1/3