Question

in the laboratory of a school the sample of hard water is not available to study the comparative cleaning capacity of a sample of soap in the soft and hard water with salt from the laboratory can be added to tap water to make it hard in the experiment how is the cleaning capacity of soap compared​

Answer 1

Sulphate, Chloride or hydrogen Carbonate of Calcium or Magnesium (any one)

By adding equal amount of soap to water taken in two test tubes, shaking vigorously and comparing the length of lather or foam formed in each test tube.