Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

Three separate portions of $25.0\,\text{cm}^3$ of $0.1\,\text{mol dm}^{-3}\,\text{NaOH(aq)}$ are each introduced into one of three different acid solutions, as outlined. Before any mixing takes place, the temperature of each solution is $298\,\text{K}$. Which statement correctly describes the temperature increases produced when each acid is mixed separately with NaOH?

  • AThe temperature rise in all three mixtures is the same.
  • BThe temperature rise using $\text{H}_2\text{SO}_4$ and HCl is the same.
  • CThe temperature rise using $\text{CH}_3\text{CO}_2\text{H}$ is greater than using HCl.
  • DThe greatest temperature rise occurs using $\text{H}_2\text{SO}_4$.

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