Calcium carbonate is an insoluble solid. Calcium carbonate can be made by adding excess aqueous calcium chloride to aqueous sodium carbonate. $$\[ \mathrm{CaCl}_{2}(\mathrm{aq})+\mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{aq}) \rightarrow \mathrm{CaCO}_{3}(\mathrm{~s})+2 \mathrm{NaCl}(\mathrm{aq}) \]$$ A student makes a sample of calcium carbonate. The first two steps of the method are shown in Fig. 1.1. Fig. 1.1 Describe a test the student can do on the filtrate obtained in (c) to show that the calcium chloride used is in excess. Give the result the student obtains if the calcium chloride is in excess. test ......................................................................................................................................... ................................................................................................................................................ . result ...................................................................................................................................... ................................................................................................................................................ .

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