Which of the following is the correct Ksp expression for the reaction Al(OH)₃ (s) ‡π Al₃⁺ (aq) + 3OH⁻ (aq)?
1) Ksp = [Al₃⁺][OH⁻]^3
2) Ksp = [Al(OH)₃]
3) Ksp = [Al₃⁺][OH⁻]
4) Ksp = [Al(OH)₃]^3