GCSE Chemistry 3

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ghoran
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212206
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GCSE Chemistry 3
Updated:
2013-04-08 16:54:29
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  1. To test for sulphate ions
  2. The reason we add hydrochloric acid is to
    react with any carbonates that may be present E.g. CaCO3 CaCO3 + 2HCl --> CaCl2 + CO2 + H2O we have removed a carbonate which may have given a false positive
  3. testing for carbonates - check for carbon dioxide
  4. This links to hard water because
    limestone pluS carbon dioxide produces calcium carbonate , this plus carbon dioxide produces calcium hydrogencarbonate which is temporary hardness
  5. Testing sodium sulphate for sulphate ions overall word equation
    • sodium + sodium ---> barium + sodium 
    • chloride    Sulphate      Sulphate chloride

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