A sample of river water does not give lather with soap easily when it is cold, but on heating gives ready lather with soap. Why?

Soap does not give lather with hard water. Why?

A sample of cold river water does not easily give lather with soap, but on boiling it does. In some cases the water does not give ready lather even if it is boiled. Why?

A sample of cold river water does not easily give lather with soap, but on boiling it does. Evaluate and write the chemical equation involved

Hard water does not give ready leather with soap. What are the two types of hardness?

Hard water does not give ready leather with soap. What is the reason for hardness?

Hard water does not give ready leather with soap. Suggest one method to remove hardness.

Certain samples of water do no produce easy lather with soap. What is this condition of water called?

Account for the following observations: Hard water doesn't give ready lather with soap.

Certain samples of water do no produce easy lather with soap. Suggest two methods to change this condition of water

Account for the following observations: i) The density of ice is lower than that of water. ii) Hard water doesn't give ready lather with soap.