AP Chemistry
6.6 Introduction to Enthalpy of Reaction
6.4 Heat Capacity and Calorimetry
A student investigates the enthalpy of neutralization by mixing solutions of a strong acid and a strong base in an insulated coffee-cup calorimeter. The data collected during the experiment are shown in the table below.
\[\text{H}^+\text{(aq)} + \text{OH}^-\text{(aq)} \rightarrow \text{H}_2\text{O(l)}\]
Assuming the resulting mixture has a density of \(1.00\text{ g/mL}\) and a specific heat capacity of \(4.18\text{ J}/(\text{g}\cdot^\circ\text{C})\), what is the experimental value of \(\Delta H^\circ_{\text{rxn}}\) for the neutralization reaction in \(\text{kJ/mol}_{\text{rxn}}\) of \(\text{H}_2\text{O(l)}\) formed?
| Quantity | Value |
|---|---|
| Volume of \(1.00\text{ M HCl(aq)}\) | \(50.0\text{ mL}\) |
| Volume of \(1.50\text{ M NaOH(aq)}\) | \(50.0\text{ mL}\) |
| Initial temperature of both solutions | \(21.3^\circ\text{C}\) |
| Maximum temperature reached after mixing | \(28.0^\circ\text{C}\) |
\[\text{H}^+\text{(aq)} + \text{OH}^-\text{(aq)} \rightarrow \text{H}_2\text{O(l)}\]
Assuming the resulting mixture has a density of \(1.00\text{ g/mL}\) and a specific heat capacity of \(4.18\text{ J}/(\text{g}\cdot^\circ\text{C})\), what is the experimental value of \(\Delta H^\circ_{\text{rxn}}\) for the neutralization reaction in \(\text{kJ/mol}_{\text{rxn}}\) of \(\text{H}_2\text{O(l)}\) formed?
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