To find 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, giving a temperature rise of $12^\circ\text{C}$. A second experiment follows the same procedure, except that $50.0\ \text{cm}^3$ of $2.00\ \text{mol dm}^{-3}$ sodium hydroxide is added to $50.0\ \text{cm}^3$ of $2.00\ \text{mol dm}^{-3}$ hydrochloric acid. How much does the temperature increase in the second experiment?
- A$6^\circ\text{C}$
- B$12^\circ\text{C}$
- C$24^\circ\text{C}$
- D$48^\circ\text{C}$