Question

a gas produced in a laboratory is highly soluble in water forms colourless solution. It solution turns pink when added few drops of phenolphthalein is added to it. what is the nature of gas???

Answer 1

The nature of gas is base because phenolphthalein is often used as indicate in acid-base titration. And it turns colorless I acidic solution and turns pink in base solution

Answer 2

Phenolphthalein indicator is colorless in acidic medium or solution whereas in basic solution it turns pink.

Given that the gas is soluble and its solution turns the phonolphthalein indicator pink then we conclude that:

1) The gas is soluble in water

2) The gas is basic

The gas therefore should have the properties above.

A soluble basic gas that we have is the Ammonia gas.

Ammonia gas is soluble in water.

This solution is basic and turns the phenolphthalein indicator pink.