Question

Consider the following system at equilibrium.CaCO3(s) Double headed arrow. Ca2(aq) + CO2(aq)The addition of which compound will cause a shift in equilibrium because of a common ion effect?-CCl4-CO2-CuSO4-Na2CO3

Answer 1

Na₂CO₃

Procedure

Considering the equation: CaCO₃(s) ↔ Ca₂(aq) + CO₂

The common-ion effect is used to describe the effect on an equilibrium when one or more species in the reaction are shared with another reaction. This effect will be based on Le Chatelier's principle.

In this case, a common ion will be the carbonate ion, which is a polyatomic ion with the formula of CO₃²⁻. This will come from the Na₂CO₃.

Given that the effect is affecting the reagent, the equilibrium will shift towards the products.