Hard and soft water

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  • Created by: avbucks
  • Created on: 19-03-13 08:39

Reacting with soap

  • Soft water + soap -> lather (easily)
  • Hard water + soap -> scum
  • This means more soap is needed to make hard water into lather.
  • Soapless detergents do not form scum.

Hard water

  • Hard water - dissolved compounds usually calcium or magnesium.
  • These compounds dissolve when water comes into contact with rocks.

Two types of hard water:

  • Permanent hard water - remains hard when boiled.
  • Temporary hard water - softened by boiling.
  • Temporary hard water contains hydrogencarbonate ions (HCO3-) that decomposes


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