Transition element colours

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9 Terms

1
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Cu2+ (aq) + 2OH- (aq) —> Cu(OH)2 (aq)

blue solution —> blue precipitate

2
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Fe2+ (aq) + 2OH- (aq) —> Fe(OH)2 (aq)

pale green solution—> green precipitate

3
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Fe3+ (aq) + 3OH- (aq) —> Fe(OH)3 (aq)

yellow solution —> brown precipitate

4
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Mn2+ (aq) + 2OH- (aq) —> Mn(OH)2 (aq)

pale pink solution —> brown precipitate

5
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Cr3+(aq) + 3OH- (aq) —> Cr(OH)3 (aq)

violet/ green solution —> green precipitate

6
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[Cr(H2O)6]3+ (aq) + 6OH- (aq) ⇌ [Cr(OH)6]3- + 6H2O

violet solution —> green solution

7
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[Cr(H2O)6]3+ (aq) + 6NH3 (aq) ⇌ [Cr(NH3)6]3- + 6H2O(l)

violet solution —> purple solution

8
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[Cu(H2O)6]2+ (aq) + 4NH3 (aq) ⇌ [Cu(NH3)4(H2O)2]2+ + 4H2O(l)

blue solution —> deep blue solution

9
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[Cu(H2O)6]2+ (aq) + 4Cl- (aq) ⇌ [Cu(Cl)4]2- + 6H2O(l)

blue solution —> yellow solution

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