Question

A colourless solution of calcium hydroxide in a test tube turns ..... on blowing in it through a blow tube for some time.

Answer 1

Lime water is solution of Calcium Hydroxide almost as clear as water When Carbon di oxide gas is passed through it it turns milky ....☺️☺️

Answer 2

Dear Student,

◆ Answer -

A colourless solution of calcium hydroxide in a test tube turns milky on blowing in it through a blow tube for some time.

● Explanation -

We exhale carbon dioxide through our breath.

When CO2 is blowed into calcium hydroxide solution, white precipitate of calcium carbonate is formed that makes limewater milky in appearance.

Ca(OH)2 + CO2 --> CaCO3 + H2O

Thanks dear. Hope this helps you...