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Rates of reaction

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Question 38

A student investigates the rate of reaction between calcium carbonate and hydrochloric acid:

CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g) \text{CaCO}_3(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{CaCl}_2(\text{aq}) + \text{H}_2\text{O}(\text{l}) + \text{CO}_2(\text{g}) CaCO3​(s)+2HCl(aq)→CaCl2​(aq)+H2​O(l)+CO2​(g)

In each experiment, excess calcium carbonate is added to a sample of hydrochloric acid.

The results from three of these experiments are plotted on the graph below.

Reaction Curves

The three experiments are defined as follows:

  • Experiment 1: 100 cm3 of 1.0 mol dm−3 HCl(aq)1.0\text{ mol dm}^{-3}\ \text{HCl}(\text{aq})1.0 mol dm−3 HCl(aq) with excess calcium carbonate large chips at 25∘C25^\circ\text{C}25∘C. This is represented by Curve B.
  • Experiment 2: 100 cm3 of 1.0 mol dm−3 HCl(aq)1.0\text{ mol dm}^{-3}\ \text{HCl}(\text{aq})1.0 mol dm−3 HCl(aq) with excess calcium carbonate powder at 25∘C25^\circ\text{C}25∘C.
  • Experiment 3: 50 cm3 of 1.0 mol dm−3 HCl(aq)1.0\text{ mol dm}^{-3}\ \text{HCl}(\text{aq})1.0 mol dm−3 HCl(aq) with excess calcium carbonate powder at 25∘C25^\circ\text{C}25∘C.

Which curve on the graph represents the results for Experiment 2?

Curve A

Curve B

Curve C

None of the curves

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