Question

when gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky ​

Answer 1

Answer:

When lime stone is heated, calcium oxide and carbon dioxide are formed. This carbon dioxide gas is passed through freshly prepared lime water, insoluble calcium carbonate and water are formed. In this reaction, lime water turns milky.

Answer 2

Answer:

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Explanation:

(i) On heating, limestone undergoes thermal

decomposition to form calcium oxide (quick

lime) and carbon dioxide.

CaCO3(s) ∆ CaO(s) + CO2

↑

quick lime

(ii) Calcium oxide when dissolved in water forms

Calcium hydroxide (lime water).

CaO(s) + H2

O(l) → Ca(OH)2(aq)

Calcium

hydroxide

(iii) When carbon dioxide is passed through lime

water it turns milky due to formation of white

precipitate of Calcium carbonate.

Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2

O(l)

Calcium

carbonate