Question

when the gas formed on heating limestone is passed through freshly prepared lime water, the limewater turns milky. give scientific reason

Answer 1

Limestone is made up of calcium carbonate.

When calcium carbonate is heated Carbon (iv) oxide is evolved.

Lime water is made up of Calcium hydroxide.

When carbon (iv) oxide is passed through lime water, the Carbon (iv) oxide reacts with calcium hydroxide to form Calcium carbonate which is a white precipitate since it's is an insoluble salt.

This white precipitate is what makes the solution milky.

Answer 2

$\large\boxed{\fcolorbox{blue}{yellow} {Answer}}$

1. When limestone is heated, calcium oxide and carbon dioxide are formed.

2. 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.

$\large\boxed{\fcolorbox{blue}{yellow} {Chemical Equation }}$

Ca(OH)2 + CO2 ⟶ CaCO3 ↓ H2O

Calcium Carbon Calcium Water

Hydroxide dioxide carbonate

Hope it helps!

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