Advertisements
Advertisements
Question
Why does the hardness of water render it unfit for use in a washing purposes.
Advertisements
Solution
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
RELATED QUESTIONS
Give two example of Solvent other than water.
Discuss the importance of water as a solvent for plants.
What do you mean by solubility of a solute in a solvent ?
'Water is the universal solvent'. Comment.
How is air dissolved in water different from ordinary air?
What is soap? For what is it used?
Give a reason why boiled water tastes flat.
Select the correct answer of the following statement:
The medium of dissolution which allows the solute to dissolve in it.
Select the correct answer from the choice given in the options.
A deliquescent salt of a divalent metal _____.
Explain the importance of dissolved salts in water.
