1. Fe3+ + SCN–  FeSCN2+ KSCN = colourless, Fe(NO3)3 = colourless
mixed = brown, red, rusty, etc. ,
FeSCN2+ provides the colour
Darker brown , (more SCN–)
shift right (toward FeSCN2+)
3- Darker brown , (more Fe3+)
4- Lighter brown , (less Fe3+)
shift left (away from FeSCN2+)
11. None (they are all the same) ,
Only temperature changes Kc
12/10/99

2. Equilibrium Lab 12 Fe3+ SCN– FeSCN2+  SCN– =    None*
12/10/99
12 Fe3+ SCN– FeSCN2+
 SCN– =    None*
 Fe3+ =    Na2HPO4**
 Fe3+ =    Fe(NO3)3***
*(With  SCN–, only a  SCN– will reestablish equilibrium. None of these chemicals work. (addition of Na2HPO4 can decrease FeSCN2+ to its original [ ], but not the others).
**Fe3+ has been increased. The only way to reestablish equilibrium is to decrease Fe3+.
***Fe3+ has decreased. The only way to reestablish equilibrium is to increase Fe3+.

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The Haber process
12/10/99
A second application of Le chatelier’s principle (film = 10 min)
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