(a) What is a soap? Why are soaps not suitable for washing clothes when the water is hard?
(b) Explain the action of soap in removing an oily spot from a piece of cloth.

What is the problem with hard water for washing clothes with soap ?

How does soap help in washing clothes?

What is the difference between soaps and detergements ? State in brief the cleaing action of soaps is removing an oily spot from a fabric. Why are soaps not very effective whene a fabric is washed in hard water ? How is this problem resolved ? .

Explain the cleaning action of soap . Why do soaps not work in hard water ?

Why do soaps not work in hard water ?

Explain the formation of scum when hard water is treated with soap.

(a) When wax is rubbed on cloth, the cloth becomes water proof. Explain why ?

Asseriton : Hard Water is not fit for washing clothes. Reason : It contains Ca^(+2) & Mg^(+2) ion which can forms ppt with soap & detergents.

What is the difference between the molecules of soaps and detergents, chemically ? Explain the cleansing action of soaps. or How many groups and periods are there in the modern periodic table ? How do the atomic size and metallic character of elements vary as we move : 1. along the group 2. along the period :

During an educational trip, a student of botany saw a beautiful lake in a village. She collected many plants from that area. She notices that villagers were washings clothes around the lake and at some places waste material from houses was destroying its beauty. After few years, shw visited the same lake again. She was suprised to find that the lake was covered with algae, stinking smell was coming out and its water had become unusable. Can you explain the reason for this condition of the lake ?