(a) Describe an activity with diageam to illustrate that the reaction of metal carbonates or metal hydrogen carbonates with acids produces carbon dioxide. Write the relevant equations of all the reactions that take place. (b) Name any two forms in which calcium carbonate is found in nature.

(a) Describe an activity with diageam to illustrate that the reaction

1.	(a) Describe an activity with diageam to illustrate that the reaction of metal carbonates or metal hydrogen carbonates with acids produces carbon dioxide. Write the relevant equations of all the reactions that take place. (b) Name any two forms in which calcium carbonate is found in nature.
Answer» Solution :(a) Take a SMALL amount of metal carbonate such as `(Na_(2)CO_(3))` or metal hydrogen carbonate `(NaHCO_(3))`and to this add few drops of dilute hydrochloric acid. The reaction immediately starts resulting in the evolution of carbon dioxide GAS which is evolved with brisk effervesscence. With th help of a delivery tube, pass the vapours of the gas evolved into LIME water. Calcium hydroxide present in lime water immediately becomes milky due ot formation of solid calcium carbonate. The chemical reactions that occur are listed as follows : `Na_(2)CO_(3)(s)+2HCl(AQ)to2NaCl(aq)+H_(2)O(aq)+CO_(2)(g)` `NaHCO_(3)(s)+HCl(aq)to NaCl(aq)+H_(2)O(aq)+CO_(2)(g)` `underset(("Lime water"))(Ca(OH)_(2)(aq))+CO _(2)(g)tounderset(("White ppt."))(CaCO_(3))(darr)+H_(2)O(aq)` Calcium carbonate `(CaCO_(3))` occurs as marble and also as lime stone.