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Question
A substance 'X' is used as a building material and is insoluble in water. When it reacts with dil. HCl, it produces a gas which turns lime water milky.
- Write the chemical name and formula of 'X'.
- Write chemical equations for the chemical reactions involved in the above statements.
Solution
(i) Substance X is calcium carbonate \[\ce{(CaCO_3)}\] or limestone.
(ii) \[\ce{\underset{carbonate (X)}{\underset{Calcium}{CaCO3(s)}} + \underset{dil.}{2HCl(aq)}->\underset{chloride}{\underset{Calcium}{CaCl2(aq)}} + H2O(l) + CO2\uparrow}\]
Carbon dioxide gas \[\ce{(CO2)}\] evolved turns lime water milky.
\[\ce{CO2 +\underset{(lime water)}{Ca(OH)2(aq)}->\underset{milky}{CaCO3(s)}+ H2O(l)}\]
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