AP Chemistry
9.6 Free Energy of Dissolution
9.5 Free Energy and Equilibrium
9.3 Gibbs Free Energy and Thermodynamic Favorability
A student evaluating mineral deposits in a heated water-treatment line studies the hypothetical sparingly soluble salt \(\text{MX(s)}\). At each temperature, excess solid is allowed to reach equilibrium with pure water according to the following equation.
\(\text{MX(s)} \rightleftharpoons \text{M}^{2+}\text{(aq)}+\text{X}^{2-}\text{(aq)}\)
Assume that \(\Delta H^\circ_{\text{soln}}\) and \(\Delta S^\circ_{\text{soln}}\) remain constant from \(298\text{ K}\) to \(318\text{ K}\). Which statement correctly compares the equilibrium molar solubility at \(318\text{ K}\) with that at \(298\text{ K}\) and justifies the comparison?
\(\text{MX(s)} \rightleftharpoons \text{M}^{2+}\text{(aq)}+\text{X}^{2-}\text{(aq)}\)
| Quantity | Value |
|---|---|
| \(\Delta H^\circ_{\text{soln}}\) | \(+60.0\text{ kJ mol}^{-1}\) |
| \(\Delta S^\circ_{\text{soln}}\) | \(+80.0\text{ J mol}^{-1}\text{ K}^{-1}\) |
Assume that \(\Delta H^\circ_{\text{soln}}\) and \(\Delta S^\circ_{\text{soln}}\) remain constant from \(298\text{ K}\) to \(318\text{ K}\). Which statement correctly compares the equilibrium molar solubility at \(318\text{ K}\) with that at \(298\text{ K}\) and justifies the comparison?
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