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cation,anion unknown compound

  • 20-11-2011 5:11pm
    #1
    Registered Users, Registered Users 2 Posts: 20


    how do you identify the cations and anions present in an unknown compound


Comments

  • Posts: 3,505 ✭✭✭ [Deleted User]


    Depends entirely on what resources are available to you and what kind of cations/anions are possible.


  • Registered Users, Registered Users 2 Posts: 20 tyw3724e


    yes, but thats all i have to go on


  • Registered Users, Registered Users 2 Posts: 748 ✭✭✭boxer.fan


    Use an ion selective chromatography column. Simple enough procedure. Choose solvent carefully.
    When ions are separated use analytical techniques/instruments at your disposal to identify compounds.


  • Registered Users, Registered Users 2 Posts: 20 tyw3724e


    i don't really understand that, i've only chemistry for a month


  • Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭j4vier


    from my understanding of your question op, you are just looking at general positive tests for anions and cations hence my vague answer.

    If you are looking for example for a test for the chloride anion, you take a chloride containing compound such as zinc chloride and you react it with silver nitrate , that represents a positive test for chloride since silver chloride will form. This is an example of a positive test for chloride.

    You are reacting two compounds together and looking for a change in colour, formation of precipitates etc

    Same thing for cations. You should look at examples of flame tests since different cations will lead to different coloured flames.


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  • Registered Users, Registered Users 2 Posts: 20 tyw3724e


    thanks


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