Question

Calculate the equilibrium concentration of Zn²+ in a 0.30-M solution of

a) 0.15 M
b) 0.20 M
c) 0.25 M
d) 0.30 M

Answer 1

The equilibrium concentration of Zn²+ in a saturated solution of ZnS can be determined by the solubility equilibrium constant (Ksp). The concentration of Zn²+ in different Molarity (M) solutions is equal to the solubility concentration determined by Ksp.

Step-by-step explanation:

To calculate the equilibrium concentration of Zn²+ in a 0.30-M solution, we need to find the solubility equilibrium constant (Ksp) for ZnS, as Zn²+ combines with sulfide ions (S²-) to form ZnS precipitate.

The Ksp for ZnS is given as 8.0 x 10-27. Since ZnS dissociates into Zn²+ and S²-, the equilibrium concentration of Zn²+ in a saturated solution of ZnS would be equal to the solubility concentration, which is determined by the value of Ksp.

Here are the equilibrium concentrations of Zn²+ in different Molarity (M) solutions:

1. 0.15 M: Concentration of Zn²+ is equal to the solubility concentration determined by Ksp.
2. 0.20 M: Concentration of Zn²+ is equal to the solubility concentration determined by Ksp.
3. 0.25 M: Concentration of Zn²+ is equal to the solubility concentration determined by Ksp.
4. 0.30 M: Concentration of Zn²+ is equal to the solubility concentration determined by Ksp.