A method used to investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions is shown. - Place $50 \mathrm{~cm}^{3}$ of dilute hydrochloric acid in a conical flask. - Add a known volume of water to the conical flask. - Heat the conical flask to the required temperature. - Add 1.0 g of calcium carbonate to the conical flask. - Measure the time taken for the reaction to finish. Which volume of water and which temperature give the shortest time taken for the reaction to finish? | Option | volume of water added/ $\mathrm{cm}^{3}$ | temperature $/{ }^{\circ} \mathrm{C}$ |
Explanation
To investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions, the volume of water and temperature should be such that the reaction mixture is heated to the required temperature and the reaction is not hindered by excess water. Therefore, the shortest time taken for the reaction to finish is given by option | 40 | 50 |.
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