chemistry - water

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key points

  • hard water contains dissolved compounds such as calcium and magnesium salts.
  • the calcium and/or magnesium ions in hard water react with soap producing a percipitate called scum.
  • temporary hard water can produce a solid scale when its heated, reducing the effeicency of heating systems like kettles.
  • hard water is better than soft water for developing teeth and bones. it may also prevent heart disease.
  • soft water does not contain salts that produce scum or scale.
  • hard water can be soften by


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