Advertisements
Advertisements
प्रश्न
Why is soap not suitable for washing clothes when the water is hard?
उत्तर
(1) Hard water contains calcium and magnesium salts; and, when a soap is used for washing clothes with hard water, a good amount of it gets utilised in reacting with the calcium and magnesium ions to form an insoluble scum. So, a large amount of soap gets wasted in this process.
(2) The curdy precipitate called scum, produced by the reaction of hard water on soap, sticks to the clothes making them difficult to be cleaned. Therefore, soaps are not suitable for washing clothes in hard water.
APPEARS IN
संबंधित प्रश्न
Why do soaps not form lather in hard water?
People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
What are the raw materials required for making soap in a laboratory (or at home)?
Give the reason of formation of scum when soaps are used with hard water.
Explain the action of soap in removing an oily spot from a piece of cloth.
Distinguish between esterification and saponification reactions of organic compounds.
Soap is a salt of ______ and sodium hydroxide.
What are the three main constituents of soap?
In the soap micelles
