Question

Soap causes scum in hardwater, why ? what is the alternative for soaps while washing in hard water?

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Answer 1

Answer:

Hard water and soap produce a curdy precipitate called soap scum. ...

Soap contains sodium salt from stearic acid.

In soft water, this sodium dissolves easily, but in hard water, it binds to the minerals and produces insoluble calcium or magnesium stearate, also known as soap scum.

Soap scum or lime soap is the white solid composed of calcium stearate, magnesium stearate, and similar alkali metal derivatives of fatty acids. These materials result from the addition of soap and other anionic surfactants to hard water.

Alternate soaps:

With the extra minerals gone, soaps, detergents, and shampoos are able to foam and rinse clean. Pantene and Garnier shampoos and conditioners work well with hard water, as does Olay Ribbons Body Wash