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
Give reason for Table salt becomes moist during rainy season.
Discuss the importance of water as a solvent for plants.
How is air dissolved in water different from ordinary air?
Explain why boiled or distilled water tastes flat.
Explain the terms:
Solvent
In which of the following substances will there be
Increase in mass
In which of the following substances will there be
Decrease in mass
In which of the following substances will there be
No change in mass when they are exposed to air?
Sodium chloride
Iron
Conc. sulphuric acid
Table salt
Sodium carbonate crystals
What is soap? For what is it used?
State whether the following statement is true or false.
Water can be separated from salt by evaporation.
