The advantage of detergents over soaps is
(1) Detergents are soluble in water
(2) Detergents could not give much lather
(3) Detergents give lather even with hard water
(4) Soaps give lather with only soft water
Answer: (3) Soaps are made of materials found in nature. Detergents are synthetic. A big drawback of washing with soap is that the minerals in the water react with those in soap, leaving an insoluble film. Detergents react less to minerals in water and, for all practical purposes, are the product of choice for laundry, unless you have very soft water. On the other hand, soap will combine with the magnesium and calcium ions in hard water to create an insoluble residue that can clog drains and stick to clothing.
