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- The Perpetually Curious! › Canonical › ChemistryArticle
💧 When Water Turns Gentle: The Science and Story of Water Softening
From section: Frequently Asked Questions+Why does soap behave differently in hard water? Calcium and magnesium ions react with true soap molecules to form insoluble salts commonly known as soap scum. This reduces lather and may leave residues on skin, clothing, fixtures, and other surfaces. …