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Acids,Bases and Salts — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAcids,Bases and Salts4 Marks
Question
We cannot prepare calcium sulphate by treating marble chips with dilute sulphuric acid. Outline the procedure to prepare calcium sulphate from marble chips.
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Answer

Marble chips (CaCO3) initially reacts with dilute sulphuric acid to form insoluble calcium sulphate, which settles on its exposed surface. This in turns cuts off dilute sulphuric from the marble chips and hence the reaction stops. In order to prepare calcium sulphate from marble chips following steps are followed.
(i) Marble chips are dissolved in dilute nitric acid so as to form soluble calcium nitrate solution.
CaCO3 + 2HNO3 (dil)→ Ca(NO3)2 + H2O + CO2
(ii) The reaction mixture is filtered and a clear solution of calcium nitrate is collected. To this solution is added excess of sodium sulphate solution when insoluble calcium sulphate precipitates out.
$Ca \left( NO _3\right)_2+ Na _2 SO _4 \longrightarrow 2 NaNO _3+ CaSO _4 \downarrow$
(iii) The reaction mixture is then filtered. The insoluble precipitate of calcium sulphate is washed with hot water and is finally dried in the folds of a filter paper.

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