Chemistry C3 Edexcel GCSE Overview

  • Created by: Nicole
  • Created on: 03-04-13 17:41

Hardness of Water

Temporary Hardness - calcium & magnesium ions

  • produces a precipitate called limescale when heated
  • the dissolved calcium or magnesium compounds that make the water hard, decompose to form insoluble cinoiunds(limescale)
  • removing soluble calcium and magnesium ions from the water, means that it will now form a lather with soap easily
  • heating softens this type of hard water

Calcium hydrogen carbonate -> calcium carbonate + carbon dioxide + water

Perminant Hardness

  • does not lose it's hardness when heated -> still forms a scum with soap
  • wastes soap
  • hardness sometimes removed before water is used
  • heating does not soften
  • ion exchange column is needed to softnen this hard water(also works on temporary hard water
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