Question

for the following equilibrium, if cacl2 is added, how will the quantities of each component change? caso4(s)↽−−⇀ca2 (aq) so2−4(aq)

Answer 1

When CaCl2 is added to the equilibrium, the concentration of the Ca2+ ion in the solution will increase and the equilibrium will shift to the left, causing CaSO4 to precipitate out of the solution.

Step-by-step explanation:

When CaCl2 is added to the equilibrium equation CaSO4(s) ↔ Ca2+(aq) + SO42-(aq), the concentration of the Ca2+ ion in the solution will increase. As a result, the ion product of [Ca2+] times [SO42-], known as Q, will become greater than the solubility product constant (Ksp). According to Le Chatelier's principle, the equilibrium will shift to the left to relieve the stress of the added Ca2+ ion, causing additional CaSO4 to precipitate out of the solution. In the new equilibrium, the concentration of the Ca2+ ion will be larger than the sulfate ion (SO42-) concentration.

Answer 2

[Ca2+] increases, [SO2−4] decreases, mass of solid increases

Step-by-step explanation:

If calcium ions are introduced, the calcium ion concentration will increase, which then causes the equilibrium to shift left. This generates additional CaSO4 precipitate, using up additional sulfate in the process but ultimately restoring Q to its equilibrium value.