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Identify the bottles

  1. Jul 1, 2016 #1

    TT0

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    1. The problem statement, all variables and given/known data

    Screen Shot 2016-07-01 at 3.53.00 PM.png

    Identify the bottles

    2. Relevant equations



    3. The attempt at a solution

    Bottle 1 is lead nitrate as lead is the only metal that will form a precipitate with the other anions.

    Bottle 3+4 = copper sulfate + sodium carbonate -- because it produces blue precipitate

    Bottle 2+3 = hydrochloric acid + sodium carbonate -- as acid + metal = salt + hydrogen gas.

    This means sodium carbonate is bottle 3, hydrochloric acid is bottle 2, and copper sulfate is bottle 4. Can someone check this?

    If this is correct, out of interest, why doesn't hydrogen gas evolve when HCl is added to lead nitrate and copper(II) sulfate?

    Cheers!
     
  2. jcsd
  3. Jul 1, 2016 #2

    Merlin3189

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    Gold Member

    2+3 : Sodium carbonate is not a metal and the gas is not hydrogen.
    That should also explain why HCl does not produce a gas with PbNO3 or CuSO4
     
  4. Jul 1, 2016 #3

    TT0

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    I see, I forgot. CO2 and water are evolved, not H2! Other than that, is the rest of the answers correct?

    Cheers!
     
  5. Jul 2, 2016 #4

    Merlin3189

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    Gold Member

    If I have deduced correctly from your statements, you are saying;
    1 - PbNO3
    2 -HCl
    3- Na2CO3
    4 - CuSO4

    So that means;
    1 & 2 is lead nitrate + HCl -> white precipitate of
    1 & 3 is lead nitrate + sodium carbonate -> white precipitate of
    1 & 4 is lead nitrate + copper sulphate -> white precipitate of
    2 & 3 is HCl + sodium carbonate -> gas produced = CO2
    2 & 4 is HCl + copper sulphate -> no visible reaction
    3 & 4 is sodium carbonate + copper sulphate -> blue precipitate of
    all plausible, so you are correct.
    You could write out the equations for each, apart from the no reaction, if you wanted to make clear what was happening.
     
  6. Jul 2, 2016 #5

    TT0

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    I see, cheers!
     
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