Class 10 > Science

Question

A solution reacts with crushed egg-shells to give a gas that turns lime water milky. Say, whether the solution contains an acid or a base.
Medium

Solution

Egg shells are made up of CaCO₃.When CaCO₃ is treated with HCI CO₂ gas is liberated which turns lime water milky. CaCO₃(s)+2HCl(dil)-CaCl₂(aq) + H₂O(l) + CO₂(g) When CO₂ is passed through lime water(Ca(OH)₂), the following reaction takes place:Ca(OH)(aq) + CO₂(g) +CaCO₃(s) + H₂O(l)Formation of CaCO, turns it milky. Hence solution contain an acid.

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