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

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.

Explain the following observation: Aerated water bottles are kept under water during summer.

Soap does not give lather with hard water. Why?

Explain the following statements giving appropriate reasons. i) Sea water doesn't form lather with soap.

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?

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?

Account for the following: BeSO_4 and MgSO_4 are readily soluble in water.

Give reasons for the following observations. CH_3COOH is weaker than HCOOH

Give reasons for the following observations. Aldehydes and ketones undergo nucleophilic addition reactions.