Chapter 10, Problem 26QAP

(a)

Interpretation Introduction

Interpretation:

The value ΔH for the following reaction is to be calculated:

  $CaC{O}_3\to C{a}^{2+}\left(aq\right)+C{O}_3^{2-}\left(aq\right)$

Concept Introduction :

The enthalpy change for a reaction $\text{ΔH}$ is given in terms of the difference in the enthalpy of formation of the products and that of reactants.

That is $\Delta \text{H = }{\displaystyle \sum {\text{n}}_{\text{p}}{\text{ΔH}}_f}\text{(products) - }{\displaystyle \sum {\text{n}}_{\text{r}}{\text{ΔH}}_f}\text{(reactants) ------(1)}$

Where, n_p and n_r are the number of moles of the products and reactants.

(b)

Interpretation Introduction

Interpretation:

Whether the solubility of CaCO₃ increases with increasing temperature or not should be determined.

Concept Introduction :

Endothermic is defined as the absorption of heat energy during the reaction.

Exothermic is defined as the releasing of heat energy during the reaction.