Because of the presence of Calcium and Magnesium salts.
Detergents are also called soap less soaps becoz though they act likea soap in having the cleansing properties, they do not contain the usual soaps like sodium starate. detergents are better cleansing agents than soaps because they donot form insoulble calcium and magnesium salts with hard water, and hance can be used for washing even with hard water.
Mineral ions from hard water (generally calcium and magnesium) react with soap forming insoluble and diasagreeable precipitates.
SOAP
Usually soap holders or soap dispensers are the best for areas with hard water.
Hard water contains the salts of calcium and magnesium, which neutralize the soap. So that more or less amount of soap is precipitated before you get the effect of soap on the water. Only after you have wasted the certain amount of soap, you get the foam in the water. The ability of soap to clean the clothes comes only after foam formation.
It is biodegradable. * It is not suitable for washing when the water is hard. * A large quantity of vegetable oil -- which is scarce -- is used for making soap. * It has a relatively weak cleansing action. * It is less soluble in water than detergents. * Continuous use of soap makes your skin rough and dry. * Can be used even with hard water for washing clothes. * Helps us to save vegetable oils for human consumption. * It has a stronger cleansing action than soap. * It is more soluble in water than soap. == == * It is not biodegradable. This means it is not decomposed by microorganisms. * They cause water pollution in air.
Hard water does not produce lather. So soap does not work effectively with hard water as soap does not form a good lather with hard water.
One effect of soap and detergent in hard water is it will not lather as well as it does in soft water. This can affect the way the soap or detergent cleans in hard water making them less effective.
Its a vibrating thing you put these cleansing pads with water activated soap in them. You use it to wash your face.
Soap scum is calcium soap of fatty acids. It is the result of soap in hard water-- the fatty acids in soap bond with the calcium ions in hard water and create an insoluble compound.
Yes, that is what soap is for, cleansing.
It is easy to rinse soap off in very soft water. It is hard to rinse soap off in very hard water. You have to rinse and rinse and rinse. And it takes more soap to get things clean in very hard water.