An experiment is carried out to determine the rate of reaction between magnesium ribbon and dilute hydrochloric acid, which produces hydrogen gas:
Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g) \text{Mg(s)} + 2\text{HCl(aq)} \rightarrow \text{MgCl}_2\text{(aq)} + \text{H}_2\text{(g)} Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)What is the best method for measuring the rate of this reaction?
Measure the loss in mass of the flask using a balance.
Measure the volume of gas released over time using a gas syringe.
Use the disappearing cross experiment.
Monitor the change in temperature of the mixture.
91 exam-style questions on OCR GCSE Chemistry Monitoring chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.