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Thread: identifying anions and cations

  1. #1 identifying anions and cations 
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    Hi there

    I was wondering if someone could give me a description of how the tests that you use to identify anions and cations actually works

    I did this experiment at college but don't know it actually works lol


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  3. #2  
    Moderator Moderator AlexP's Avatar
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    Could you elaborate? What kind of tests?


    "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
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  4. #3  
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    I think we conducted tests to identify unknown inorganic compounds using anion and cation tests.

    First we put some solution into a beaker, then put some indicating solution to it so it changed colour, then we put another solution in it until it changes to colourless


    ....something like that

    I wanted to know how these tests work.

    here's a link to what we did

    http://students.ed.uiuc.edu/bwwolfe/...20ion%20id.doc
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  5. #4 Re: identifying anions and cations 
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    [quote="keraky"]Hi there

    umm I did exactly the same thing in college and iv got an assignmet asking me to identify how the compounds work.
    but i dont know
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  6. #5  
    Forum Ph.D. Nevyn's Avatar
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    When you add silver nitrate to the cl- ions the nitrate is displaced and the result silver chloride precipitate which is a creamy white I believe.
    When you add barium chloride to sulphate ions the sulphate ions displace the chlorine and because the sulphates of group II metals decrease in solubility down the group a white precipitate is formed.

    Not sure about this one but if I were to guess: different elements give off different wavelengths of light when heated due to electrons changing from different subshells.

    For the ammonium ion one all I can think of is that the adding of sodium hydroxide lowers the pH by combining to form water

    Thats all I know, hope it helps
    Come see some of my art work at http://nevyn-pendragon.deviantart.com/
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