State the disadvantages of hardness in water.

Temporary hardness in water can be removed by boiling. Give balanced equations to explain how, hardness in temporary hard water is removed by boiling.

A sample of water is given in a trough. State how would you prove experimentally whether the given sample is hard water or soft water.

Two samples of water are placed in a beaker individually. State how you will determine experimentally which of the two samples contains permanent hard water.