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What is the difference between soaps ...

What is the difference between soaps and detergements ? State in brief the cleaing action of soaps is removing an oily spot from a fabric. Why are soaps not very effective whene a fabric is washed in hard water ? How is this problem resolved ? .

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Difference betwern soaps and detergents. See Q. 12, 2014-15 (Delhi).
Soaps are not effective when a fabric is washed in hard water. Hardness of water is due to the presence of `Ca^(2+)` and `Mg^(2+)` ions. These ions react with soaps to form white precipitates called scum. This scum sticks to the surface of the clothes and hence soaps are not very effective when a fabric is washed.
This problem can be solved by using detergents as they are more soluble in hard water and have better cleansing actions.
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