1.

1.4 g of a sample of chalk (CaCO_(3)) containingclay as impurity were treated with excess of dilute hydrochloric acid. Volume of CO_(2) evolved when measured at 15^(@)C and 768 mm pressure was 282cm^(3). Calculate the percentage purity of the sample.

Answer»


SOLUTION :`underset(100g)(CaCO_(3))+2HCl rarrCaCl_(2)+H_(2)O+underset(22400cm^(3)"at S.T.P.")(CO_(2))`
First CONVERT the GIVEN volume to volume at S.T.P.
Calculate the MASS of `CaCO_(3)` from which this volume of `CO_(2)` at S.T.P. is obtained. Then calculate `%` age purity.


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