A student studies the rate of reaction between lumps of calcium carbonate and dilute hydrochloric acid with the apparatus shown.
CaCO$_3$(s) + 2HCl(aq) → CaCl$_2$(aq) + CO$_2$(g) + H$_2$O(l)
The calcium carbonate was in excess.
The apparatus diagram shows lumps of calcium carbonate in a conical flask containing dilute hydrochloric acid, connected via tubing to a gas syringe labelled 'gas syringe'.
(a)[2]
What measurements should the student take while the reaction is in progress in order to find the rate of reaction?
(b)[3]
What change occurs to the rate of reaction as the reaction continues? Explain your response.
(c)[4]
Explain, in terms of collisions, why the rate of reaction increased.
(d)[2]
Other than using a higher temperature, suggest two further ways to make this reaction go faster.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “gas volume” …