22(a). Limestone is used to make cement Samples of limestone from different quarries contain different amounts of calcium carbonate. A technician heats different powdered limestone samples so they undergo thermal decomposition and collects the carbon dioxide produced.

Describe and explain how the results from the experiments could be used to indicate which sample is the purest Assume that the limestone contains no other carbonates
include a labelled diagram to show how the equipment could be set up.