Advertisements
Advertisements
प्रश्न
Why does the hardness of water render it unfit for use in a washing purposes.
Advertisements
उत्तर
If hard water is used, calcium and magnesium ions of the water combine with the negative ions of the soap to form a slimy precipitate of insoluble calcium and magnesium usually called soap curd (scum).
Formation of soap curd will go on as long as calcium and magnesium ions are present. Till then, no soap lather will be formed and cleaning of clothes or body will not be possible. Moreover, these precipitates are difficult to wash from fabrics and sometimes form rusty spots if iron salts are present in water.
APPEARS IN
संबंधित प्रश्न
Discuss the importance of water as a solvent for plants.
What do you mean by solubility of a solute in a solvent ?
What are the observations and conclusions when tap water is boiled and evaporated in watch glass?
How is air dissolved in water different from ordinary air?
State the term: (Do not give examples)
A solution where solvent is a liquid other than water.
Explain why:
Lakes and rivers do not suddenly freeze in the winters.
Explain why:
The solute cannot be separated from a solution by filtration.
In which of the following substances will there be
Increase in mass
What is the advantage of a detergent over soap?
What insoluble substance? Give examples.
