Thursday, 16 May 2013

2.38 describe tests for the anions


i) Cl-, Br- and I-, using dilute nitric acid and silver nitrate solution
  • Chloride ions + nitric acid + silver nitrate > white precipitate (silver chloride)
  • Bromide ions + nitric acid + silver nitrate > cream precipitate (silver bromide)
  • Iodide ions + nitric acid + silver nitrate > yellow precipitate (silver iodide)
ii) SO2- (sulphate ions) using dilute hydrochloric acid and barium chloride solution
  • SO4(2-) + HCl + Ba(2+) > white precipitate (barium sulphate)
iii) CO2-, using dilute hydrochloric acid and identifying the carbon dioxide evolved
  • Carbonate + acid > salt + water + carbon dioxide
  • Carbon dioxide produced will turn lime water cloudy

7 comments:

  1. really helpful, thanks so much! In any way related to lucychemistry.blogspot??

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    Replies
    1. Np! no it isn't, but that looks good too :)

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  2. change ur name to the queen of backside saving

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  3. Why do you add the hydrochloric acid for the sulfate test?

    ReplyDelete
  4. Wow very helpful in my chemistry test revision! thanks

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