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प्रश्न
Why does the hardness of water render it unfit for use in a washing purposes.
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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.
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संबंधित प्रश्न
Discuss the importance of water as a solvent for our body .
What are the observations and conclusions when tap water is boiled and evaporated in watch glass?
Explain why boiled or distilled water tastes flat.
Explain why:
The solute cannot be separated from a solution by filtration.
In which of the following substances will there be
Increase in mass
Give a reason why water is called a ‘universal solvent’ but, an alkali is not.
Give a reason why boiled water tastes flat.
Give a reason for the following.
Water is a universal solvent.
What insoluble substance? Give examples.
Take two pots with similar plants. Water one of the plants with tap water and the other with seawater. Record your findings and note the difference observed.
