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
How do the solubility of a solid and a gas affected by Increase in temperature.
Give two example of Solvent other than water.
Why is sea water salty ?
What are the observations and conclusions when tap water is boiled and evaporated in watch glass?
Explain the term:
Solute
State the term: (Do not give examples)
A solution where solvent is a liquid other than water.
In which of the following substances will there be
Increase in mass
Why does the hardness of water render it unfit for use in a boiler.
Give a reason why water is called a ‘universal solvent’ but, an alkali is not.
State why ‘Water is considered a universal solvent’. Give the reason for the same.
