Question

Why does hard water form insoluble scum with soap?

Answer 1

Answer:

When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. Scum builds up on clothes, baths and sinks.

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Answer 2

Answer:

When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. Scum builds up on clothes, baths and sinks.

In some areas of the country hard water is caused by a high mineral content, which are generally calcium and magnesium. This hardness is largely due to groundwater that flows over or through limestone.

Explanation:

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