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Water containing dissolved Calcium ions (Ca2+) or Magnesium ions (Mg2+) react with soap to form scum.
E.g: Calcium ions in hard water react with the stearate ions in soap solution to form scum.
Ca 2+ (aq) + 2 stearate 1- (aq) >reacts to form> Ca(stearate)2 (s)
Quite complicated but i hope that helps.
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∙ 14y ago
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