Question
Hard water does not give lather with soap due to the
presence of which ions?Solution
Hard water contains dissolved calcium (CaĀ²āŗ) and magnesium (MgĀ²āŗ) ions, which react with soap molecules (sodium or potassium salts of fatty acids) to form insoluble scum instead of forming lather. This makes it difficult for soap to work effectively.
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