Using the apparatus shown, a student investigates how quickly excess copper(II) carbonate reacts with dilute sulfuric acid.
$\text{CuCO}_3\text{(s)} + \text{H}_2\text{SO}_4\text{(aq)} \rightarrow \text{CuSO}_4\text{(aq)} + \text{CO}_2\text{(g)} + \text{H}_2\text{O\,(l)}$
(a)[1]
Identify the apparatus marked X.
(b)[1]
Explain why this method is chosen rather than adding the copper(II) carbonate to the acid and then fitting the bung again.
(c(i))[1]
Give the labels for both axes of the graph.
(c(ii))[3]
List three observations the student makes in the flask as the reaction proceeds.
(c(iii))[2]
Use the graph to explain how the rate of reaction changes during the reaction.
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