practical applications and calculations

Question 1

in a standard solution of sparingly soluble salt, how is the solubility product constant (ksp) expressed?

Answer 1

for a salt ab that dissociates as ab ↔️ a+ + b-, ksp = [a+][b-]

Question 2

what is the common ion effect, and how does it influence solubility?

Answer 2

the common ion effect states that the solubility of a salt is reduced in a solution that already contains one of the ions of the salt. This shifts the equilibrium toward the solid salt, decreasing its solubility.