GCSE Chemistry 3
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To test for sulphate ions
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
testing for carbonates - check for carbon dioxide
This links to hard water because
limestone pluS carbon dioxide produces calcium carbonate , this plus carbon dioxide produces calcium hydrogencarbonate which is temporary hardness
Testing sodium sulphate for sulphate ions overall word equation
- sodium + sodium ---> barium + sodium
- chloride Sulphate Sulphate chloride
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