When KOH(aq) is added to the solution, will the solubility of Ni(OH)₂ increase, decrease, or remain the same? Give the balanced net ionic equation for the dissolution process. [Hint: Refer to complex ions formations]

The [Pb²⁺] and [AsO₄³⁻] in a certain saturated Pb₃(AsO₄)₂ solution are both equal to 8.3×10⁻⁸. In a saturated solution with [Pb²⁺] = 0.020 M, what is [AsO₄³⁻]?

Assuming that solid Ag₂SO₄ (K_sp = 1.2×10^–5) is in equilibrium with a Na₂SO₄ solution, what amount of Na₂SO₄ in molarity is needed to make a 3.5×10^–3 M Ag⁺ solution?

Consider the graphs shown below which show how Mg(OH)₂ behaves under different conditions. The y-axis in each graph represents the solubility of Mg(OH)₂ and the x-axis represents the concentration of another reagent. Identify the graph that corresponds to the solubility of Mg(OH)₂ as HCl is added to the solution.

Chloric acid (HClO₃) will ionize less than in which solution than it does in pure water?