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XY ⇆ X⁺ + Y⁻
a 1
r 0,4
______________
s 0,6 0,4 0,4
Penjelasan :
karena terurasi 40%, berarti yang bereaksi (terurai) = 1 x 40/100 = 0,4 mol
dna yang tersisa = 1 - 0,4 = 0,6 mol
M X⁺ = M Y⁻ = mol/Volume
= 0,4/1 = 0,4 M
M XY = mol/Volume
= 0,6/1 = 0,6 M
[M X⁺] [M Y⁻]
Kc = ____________
[M XY]
[0,4] [0,4]
Kc = ________
[0,6]
Kc = 0,2667
Kc = 0,27
Jadi, harga Kc adalah 0,27 (Jawaban B)