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Homework Help: CHEMISTRY: I need help filling out this flow chart for Group 1 Cations

  1. Nov 5, 2009 #1
    1. The problem statement, all variables and given/known data

    Here is my lab:

    http://comp.uark.edu/~rallan/Exp20.pdf [Broken]

    2. Relevant equations

    None that I know of

    3. The attempt at a solution

    I ran the experiment once on a known substance and once on an unknown substance. Here are my results:

    In the known substance, Pb Hg and Ag were all present according to the tests.

    In the unknown substance, only Ag was present according to the tests.

    I really need some help with this flow diagram (the last page that says Experiment 36).

    Pretty much all I really need to know is how do I know what the "solution contains"? For example, the first part that is filled out for me says "Solution contains ions in Groups II and III" but how do I know that? And how do I know what to put in the other "solution contains" blanks?

    Thank you so much to anyone that helps.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 5, 2009 #2


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    Staff: Mentor

    That's a little bit confusing. It is not that "Solution contains", it is "Solution may contain". What it realy contains you will check later.

  4. Nov 5, 2009 #3
    So what should I put?

    Thank you so much for your help I have class in 2 hours and I need to get this done.
  5. Nov 5, 2009 #4


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    Science Advisor
    Homework Helper
    Gold Member

    If the test is negative (no ppt where one is expected) you put 'nothing'. If you have a ppt where one is expected (ie. when ammonia is added to the hot precipitate) you put 'name of the metal species'. For example, if you get a gray solid after treating the hot ppt of the HCl treatment, you would put 'Hg2+2' in that blank.
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