Category Archives: Hard and soft water

Hard and soft water

Reaction with soap Soft water readily forms lather with soap. Hard water reacts with soap to form scum and so more soap is needed to form lather: the presence of calcium ions and magnesium ions in the water makes it hard. Soapless detergents do not form scum with hard water. Origin of scum (hard water + soap) Hard water contains dissolved calcium or

Read more