Question

You provided hard water and soft water is two seperate test tube what do you observe on adding equal quantity of soap soln to each sample of $H_{2}O$ and shaking them $10$ times.

Answer 1

Soap reacts with soft water and makes foams

Soap solution doesn't react completely with hard water and makes less amount of foam.

If we are shaking 10 times for these solutions soft water have high intensity of foams but hard water will have a low intensity of foams.