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Topic: [Fe(NCS)]2+ qutestion !!  (Read 6690 times)

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Offline kuromi

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[Fe(NCS)]2+ qutestion !!
« on: April 11, 2009, 12:38:53 PM »
Fe3+(yellow)   +   NCS- (colourless)     <->   FeNCS2+  (blood red)

 when i add one more drop of Fe3+ solution into test tube
and one more drop of NCS-solution into other test tube

explain why  added Fe3+ solution is blood red while added  NCS-solution is reddish dark ? 

By le Chatelier's principle , the equilibrium position shifts from left to right when conc . increased .  why  the colors are different ?
 
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Offline BluRay

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Re: [Fe(NCS)]2+ qutestion !!
« Reply #1 on: April 11, 2009, 03:49:25 PM »
Fe(SCN)2+ is not the only compound formed. There are also Fe(SCN)2+ and Fe(SCN)3 and they probably are of different colours.
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Offline Astrokel

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Re: [Fe(NCS)]2+ qutestion !!
« Reply #2 on: April 11, 2009, 04:05:43 PM »
Think about what happened to the other reactant and the end result of the combination of colour when you adding Fe3+ or thiocyanate.
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Offline kuromi

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Re: [Fe(NCS)]2+ qutestion !!
« Reply #3 on: April 12, 2009, 12:44:49 AM »
thank you for your ans.

 ;) ;)
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