To determine the enthalpy of neutralisation for a strong acid and a strong alkali, $25.0\,\text{cm}^3$ of $2.00\,\text{mol dm}^{-3}$ sodium hydroxide is mixed with $25.0\,\text{cm}^3$ of $2.00\,\text{mol dm}^{-3}$ hydrochloric acid. The temperature rises by $12\,^{\circ}\text{C}$. For a second trial, the same procedure is followed, except that $50.0\,\text{cm}^3$ of $2.00\,\text{mol dm}^{-3}$ sodium hydroxide is mixed with $50.0\,\text{cm}^3$ of $2.00\,\text{mol dm}^{-3}$ hydrochloric acid. What temperature increase is observed in the second trial?
- A$6\,^{\circ}\text{C}$
- B$12\,^{\circ}\text{C}$
- C$24\,^{\circ}\text{C}$
- D$48\,^{\circ}\text{C}$