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OCR Chemistry A - Transition Metal Colours, common colour changes?
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Hey everyone, I'm struggling to remember all the colour changes for the transition metals. I was wondering if there are some key common reactions or rules I can learn that will help. Thanks.
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#2
Sorry dude as far as i know, you just gotta remmeber them...
Reactions with OH-:
- Fe(OH)2 - Green ppt (if left in the air for a while , this is oxidised to Fe(OH)3 and turns to a brown ppt
- Fe(OH)3 - Brown ppt
- Co(OH)2 - Blue ppt
- Cu(OH)2 - Light blue ppt
(YOU MUST STATE PPT!)
Reaction with Cl2:
- CuCl2 - Pale yellow
- CoCl2 - Blue
Transition metals in solution:
- [Fe(H2O)6)]2+ - Pale green
- [Fe[H2O)6]3+ - Pale yellow
- [Co(H2O)6]2+ - Pink
- [Cu(H2O)6]2+ - Light Blue
- [Cu(H2O)2(NH3)4]2+ - Dark Blue
Transition Metals in reaction with SCN forms a Blood Red Colour
When titrating a solution against MnO4-, the end point will have a pale pink colour therefore no pH indicator is required.
Try to learn these GL =)
Reactions with OH-:
- Fe(OH)2 - Green ppt (if left in the air for a while , this is oxidised to Fe(OH)3 and turns to a brown ppt
- Fe(OH)3 - Brown ppt
- Co(OH)2 - Blue ppt
- Cu(OH)2 - Light blue ppt
(YOU MUST STATE PPT!)
Reaction with Cl2:
- CuCl2 - Pale yellow
- CoCl2 - Blue
Transition metals in solution:
- [Fe(H2O)6)]2+ - Pale green
- [Fe[H2O)6]3+ - Pale yellow
- [Co(H2O)6]2+ - Pink
- [Cu(H2O)6]2+ - Light Blue
- [Cu(H2O)2(NH3)4]2+ - Dark Blue
Transition Metals in reaction with SCN forms a Blood Red Colour
When titrating a solution against MnO4-, the end point will have a pale pink colour therefore no pH indicator is required.
Try to learn these GL =)
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(Original post by juman786)
Sorry dude as far as i know, you just gotta remmeber them...
Reactions with OH-:
- Fe(OH)2 - Green ppt (if left in the air for a while , this is oxidised to Fe(OH)3 and turns to a brown ppt
- Fe(OH)3 - Brown ppt
- Co(OH)2 - Blue ppt
- Cu(OH)2 - Light blue ppt
(YOU MUST STATE PPT!)
Reaction with Cl2:
- CuCl2 - Pale yellow
- CoCl2 - Blue
Transition metals in solution:
- [Fe(H2O)6)]2+ - Pale green
- [Fe[H2O)6]3+ - Pale yellow
- [Co(H2O)6]2+ - Pink
- [Cu(H2O)6]2+ - Light Blue
- [Cu(H2O)2(NH3)4]2+ - Dark Blue
Transition Metals in reaction with SCN forms a Blood Red Colour
When titrating a solution against MnO4-, the end point will have a pale pink colour therefore no pH indicator is required.
Try to learn these GL =)
Sorry dude as far as i know, you just gotta remmeber them...
Reactions with OH-:
- Fe(OH)2 - Green ppt (if left in the air for a while , this is oxidised to Fe(OH)3 and turns to a brown ppt
- Fe(OH)3 - Brown ppt
- Co(OH)2 - Blue ppt
- Cu(OH)2 - Light blue ppt
(YOU MUST STATE PPT!)
Reaction with Cl2:
- CuCl2 - Pale yellow
- CoCl2 - Blue
Transition metals in solution:
- [Fe(H2O)6)]2+ - Pale green
- [Fe[H2O)6]3+ - Pale yellow
- [Co(H2O)6]2+ - Pink
- [Cu(H2O)6]2+ - Light Blue
- [Cu(H2O)2(NH3)4]2+ - Dark Blue
Transition Metals in reaction with SCN forms a Blood Red Colour
When titrating a solution against MnO4-, the end point will have a pale pink colour therefore no pH indicator is required.
Try to learn these GL =)
Thanks again.
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#6
(Original post by Neptism)
What does SCN stand for?
What does SCN stand for?
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