Separated supernate and washed precipitate with hot DI water and added a drop

Separated supernate and washed precipitate with hot

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check for precipitate formation. Separated supernate and washed precipitate with hot DI water and added a drop of 0.25M Na 2 HPO 4. There was no formation of a crystalline precipitate, therefore no magnesium present. Co 2+ There was no presence of Co 2+ in my unknown solution. Added excess of solid NaF and mixed with 15 drops of NH 4 SCN. There was no formation of blue solution, therefore indicating that cobalt was not present.
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Ni 2+ There was no presence of Ni 2+ in my unknown solution. Added 3 drops of 6M NH 3 and centrifuged. Added 4 drops of (CH 3 ) 2 C 2 N 2 O 2 H 2 , mixed and let it sit for about 30 minutes to see if there was a strawberry red precipitate, but it never formed. Ag +3 There was no presence of Ag + in my unknown solution. Added 4 drops of 6M HCl and there was no formation of the white precipitate that indicates silver presence. Cu 2+ There was no presence of Cu 2+ in my unknown solution. I added 3 drops f NH 3 to turn the solution basic. Then I added 3 drops of 6M CH 3 CooH and 2 of 0.2M K 4 Fe(CN) 6 but there was no formation of a red precipitate, therefore cooper was not present.
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  • Spring '08
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