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Topic: Group A Cations Lab assistance  (Read 3454 times)

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Offline Aerosion

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Group A Cations Lab assistance
« on: October 02, 2006, 07:32:13 PM »
Okay, so I just want to confirm a conclusion that I've already made.

See, I did a lab in school, and separated Ag+ and Hg2+2 using 6M NH3.  I also added 6M NH3 to an unknown solution to separate...well, unknown elements.

Anyway, the book says that the precipitate will turn grey if there's Hg2+ and the supernatant would turn clear if NH3 was in it.  And it did, for both the known and the unknown.

So would I be right in concluding that both of the cations are present for the known and the unknown, because the results are basically the same thing?  Thanks.

Offline AWK

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Re: Group A Cations Lab assistance
« Reply #1 on: October 03, 2006, 05:14:35 AM »
If Hg(I) is present, the precipitate will be gray. To test presence of Ag(I), add an excess of HNO3 to clear ammonia solution. White precipitate indicate the presence of Ag(I).
AWK

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