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| 1. |
Soap does not work in hard water (scum) |
| Answer» Hard water\xa0contains calcium and magnesium ions. When\xa0soaps\xa0are dissolved in\xa0hard water, these ions displace sodium or potassium from their salts and form insoluble calcium or magnesium salts of fatty acids. These insoluble salts separate as scum. This is the reason why\xa0soaps do not work in hard water. | |