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Topic: Identify cation  (Read 5234 times)

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Offline eureka123

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Identify cation
« on: August 11, 2009, 06:27:04 AM »
A metal nitrate reacts with KI to give a black precipitate, which on addition of excess of KI converts into orange colour solution. Identify cation
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Offline bartek

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Re: Identify cation
« Reply #1 on: August 11, 2009, 10:32:26 AM »
Bismuth (III)
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Offline eureka123

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Re: Identify cation
« Reply #2 on: August 11, 2009, 12:48:33 PM »
are u sure ???
give the reactions and color of compounds formed and used ;)
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Offline bartek

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Re: Identify cation
« Reply #3 on: August 12, 2009, 09:48:50 AM »
Completely sure, BiI3 - black insoluble, K[BiI4] - orange soluble
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Offline BluRay

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Re: Identify cation
« Reply #4 on: August 13, 2009, 10:08:09 AM »
I confirm what bartek wrote. The book: Treadwell - "Analytical Chemistry" Vol 1, pag. 213, says so:

http://djm.cc/library/Analytical_Chemistry_Treadwell_Hall_Vol_1_edited.pdf
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