Question

10 mL of dissolution of a strong acid $\left(HA\right)$ on mixing with 10 mL of strong alkali (BOH) at the same temperature shows a temperature rise of $4^{\circ }C$. If 50 mL of same acid are mixed with 50 mL of same alkali: the temperature rise will be ____${}^{\circ }C$. Assume all the heat produced is used up in increasing temperature of mixture only.

Answer 1

10 mL of dissolution of a strong acid $\left(HA\right)$ on mixing with 10 mL of strong alkali (BOH) at the same temperature shows a temperature rise of $4^{\circ }C$. If 50 mL of same acid are mixed with 50 mL of same alkali: the temperature rise will be 4${}^{\circ }C$. This is because, the heat of neutralization per ml of acid is constant. The heat of neutralization of 10 ml of acid with 10 ml of base is used to raise the temperature of 20 ml of mixture whereas the heat of neutralization of 50 ml of acid with 50 ml of base is used to raise the temperature of 100 ml of mixture.