Write the ksp expression for the sparingly soluble compound zinc cyanide, zn(cn)2.

Kps = [Zn²⁺].[CN⁻]²

Explanation:

Let's consider the solution of zinc cyanide.

Zn(CN)₂(s) ⇄ Zn²⁺(aq) + 2 CN⁻(aq)

The solubility product (Kps) is the equilibrium constant for this solution, that is, the product of the concentration of the products raised to their stoichiometric coefficients divided by the product of the concentration of the reactants raised to their stoichiometric coefficients. Only aqueous species are included in the expression of kps.

The Kps is:

Kps = [Zn²⁺].[CN⁻]²

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.