Question

Given exothermic reaction.

\[\ce{CoCl^{2-}_4 + 6H2O_{(l)} ⇌ [Co(H2O)6]^{2+} + 4Cl^-}\]

Which one of the following will decrease the equilibrium concentration of \[\ce{CoCl^{2-}_4}\]?

Options

• Addition of HCl

• Addition of Co(NH₃)₂

• The solution is diluted with water.

• The temperature is increased.

Answer 1

The solution is diluted with water.

Explanation:

Since water is a reactant in this reaction, an increase in reactant concentration causes the equilibrium to shift forward. As a result, when the solution is diluted, the \[\ce{CoCl^{2-}_4}\] equilibrium changes.