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Unformatted text preview: can keep the solutions separate so you can run all three at the same time. Standard: The standard contains all possible ions for the entire procedure. To make it, add 5 drops of each ions nitrate into the same clean dry test tube (AgNO 3 , Pb(NO 3 ) 2 , Bi(NO 3 ) 3 , Cu(NO 3 ) 2 , Sn(NO 3 ) 4 , Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 , Al(NO 3 ) 3 , Cr(NO 3 ) 3 , Ba(NO 3 ) 2 , Ca(NO 3 ) 2 , and KNO 3 . Blank: The blank is the opposite of the standard; it contains NO ions. Use the appropriate volume of distilled water. If a positive ever appears in the blank, this is an indication that somewhere, the solutions picked up a contaminant, and you will want to re-run the tests to ensure that you have no false positives. Group I: Ag + and Pb +2 Group I ions (which traditionally include Hg +2 as well) are put together because they all have insoluble (or relatively insoluble) salts of chloride. This fact allows for easy separation of these ions (aside from lead, as its chloride is still partially...
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This note was uploaded on 01/27/2012 for the course CHM 2045 taught by Professor Josephwalter during the Fall '11 term at Dakota State.
- Fall '11