2 NaHCO3(s) ⇔ Na2CO3 (s) + H2O(g) + CO2(g) enthalpy = +128 kJ is at equilibrium. What happens to [CO2] when the H2O is added?

The question is incomplete; the complete quqestion is ;

iv. What happens to [CO2] when the H2O is added?

a. increased

b. decreased

c. no change

decreased

Explanation:

Recall that the reaction shown in the question is endothermic (positive change in enthalpy).

When water is added to the system, carbonic acid is formed  as follows;

CO2(g) + H2O(l) ---> H2CO3(aq)

This reaction is decreases the concentration of the carbon IV oxide as it dissolves in the water.

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