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Ag2CrO ------> 2Ag⁺ + CrO²⁻
Ksp = (2s)² (s)
Ksp = 4s³
4x10⁻¹² = 4s³
s³ = 4x10⁻¹²/4
s³ = 1x10⁻¹²
s = ∛1x10⁻¹²
s = 1x10⁻⁴
maka konsentrasi ion Ag⁺ = 1x10⁻⁴/2
= 0,5x10⁻⁴