The solubility of A₂X₃ in pure water, assuming that neither kind of ion reacts with water is-
(solubility product of A₂X₃, K_sp = 1.1 × 10^–23)

1. 5.0 × 10^–5 mol/L.
2. 1.0 × 10^–5 mol/L
3. 1.0 × 10^–4 mol/L
4. 5.0 × 10^–4 mol/L.