Question

A particular saturated solution of silver chromate Ag₂CrO₄ has [Ag⁺] = 5 × 10⁻⁵ and [CrO₄]²⁻ = 4.4 × 10⁻⁴ M. What is the value of K_sp for Ag₂CrO₄?

Answer 1

\[\ce{Ag2CrO4_{(s)} ⇌ 2Ag^+_{( aq)} + CrO^{2-}_{4(aq)}}\]

K_sp = \[\ce{[Ag^+]^2 [CrO^{2-}_4]}\]

= (5 × 10⁻⁵)² (4.4 × 10⁻⁴)

= 1.1 × 10⁻¹²