Results 1 to 3 of 3

Thread: Qualitative Analysis

  1. #1 Qualitative Analysis 
    Forum Sophomore biohazard87's Avatar
    Join Date
    Nov 2005
    With your mom
    I was wondering if anyone could help me. I am doing Qualitative analysis and I need some help finding ways to separate Na+, NH4+, AG+, Fe3+, Al3+, Cr3+, Mg2+, Ni2+, and Zn2+. If anyone wouldlike to help I am open to suggestions. But if you could keep in mind that this is for a small lab with very limited technology. It is just a little better than high school level chemistry. Thank you

    Noodles happen when you kiss a stranger in the alps.

    Mi padre tiene un impala.
    Reply With Quote  


  3. #2  
    Forum Senior silkworm's Avatar
    Join Date
    Nov 2005
    I don't know what the rest of the compound is, but for the most part, ionic salts an be seperated via electrolysis. Treatment with HNO3 and H2SO4 is also commonly used to seperate metals from their oxides. I have no idea what the whole compound is, so that's all I have to offer. Good luck.

    Reply With Quote  

  4. #3  
    Forum Freshman
    Join Date
    Apr 2006
    Belo Hozironte
    it's easier than you can imagine!
    i've been doing the same in my Qualitative Analysis (well, not exactly the same, but i had to saparate some ions in a solution).
    firstly, i'd recommend you a very good bibliography in this area (Qualitative Analysis, by Arthur vogel), but i believe you already know this. There you shall find almost everything you need, and it'll help you comparing the results you get.
    There are 5 groups of cations:
    Ag+ is in the first one
    Al3+, Ni2+, Fe3+, Cr3+ and Zn2+ are in the third group
    Na+, NH4+Mg2+ are in the fifth one.

    To saparate them, we must begin from the first group (using HCl, precipitating AgCl [white], for example):
    Ag+ Al3+ Ni2+ Fe3+ Cr3+ + HCl --> AgCl(solid) + Al3+ Ni2+ Fe3+ Cr3
    And so on... (using NH4S, after HCl) you can saparate each ion, separating the precipitates.
    I'm really sorry if this is not very well explained, but if you want any other information... my msn is add me!

    i hope this all wasnt useless.
    thanks for everything!
    Reply With Quote  

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts