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 The solid calcium carbonate obtained by filtration is not pure. (i) Identify one substance, other than water, which is mixed with the calcium carbonate and makes it impure. ................................................................................................................................... (ii) Describe how the substance you have identified in (d)(i) can be removed from the calcium carbonate. ......................................................................................................................................... . ...................................................................................................................................

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