Transition Metal Colours Flashcards by Archie Hutchinson

Q

Cr3+ (aq)

A

Green solution

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Q

Mn2+ (aq)

A

pale pink solution

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Q

Fe2+ (aq)

A

Pale green solution

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Q

Fe3+ (aq)

A

Yellow-Brown solution

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Q

Co2+ (aq)

A

Pink solution

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Q

Ni2+ (aq)

A

Green solution

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Q

Cu2+ (aq)

A

Blue solution

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Q

Cr3+ (aq) + NaOH (dropwise)

A

Green ppt

Cr(OH)3

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Q

Mn2+ (aq) + NaOH

A

Pale brown ppt

Mn(OH)2

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Q

Mn2+ (aq) + NaOH and left to stand

A

white ppt darkens due to oxidation

MnO2

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Q

Cr3+ (aq) excess NaOH

A

Cr(OH)3 ppt dissolves to give clear green solution

[Cr(OH)6]3-

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Q

Fe2+(aq) + NaOH

A

dark green ppt

Fe(OH)2

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Q

Fe2+(aq) + NaOH and left to stand

A

ppt goes brown from oxidation

Fe(OH)3

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Q

Fe3+ (aq) + NaOH

A

brown ppt

Fe(OH)3

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Q

Co2+(aq) + NaOH

A

Blue ppt

Co(OH)2

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Q

Ni2+(aq) + NaOH

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A

Green ppt

Ni(OH)2

Q

Cu2+(aq) + NaOH

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A

Blue ppt

Q

Cr3+(aq) + NH3 (dropwise)

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A

Green ppt

Cr(OH)3

Q

Co2+(aq) + NH3 (dropwise)

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A

Blue ppt

Co(OH)2

Q

Cu2+(aq) + NH3 (dropwise)

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A

Blue ppt

Cu(OH)2

Q

Ni2+(aq) + NH3 (dropwise)

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A

Green ppt

Ni(OH)2

Q

Cr3+(aq) + NH3 (excess)

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A

Dissolves green ppt to form violet solution

[Cr(NH3)6]3+

Q

Co2+(aq) + NH3 (excess)

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A

Dissolves blue ppt to form brown solution

[Co(NH3)6]2+

Q

Cu2+(aq) + NH3 (excess)

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A

Dissolves blue ppt to form deep blue solution

[Cu(NH3)6]2+

Ni2+(aq) + NH3 (excess)

Dissolves green ppt to form pale blue solution [Ni(NH3)6]2+

Mn2+ (aq) + NH3

Pale brown ppt Mn(OH)2

Mn2+ (aq) + NH3 and left to stand

pale brown ppt darkens MnO2

Fe2+(aq) + NH3

Dark Green ppt Fe(OH)2

Fe2+(aq) + NH3 and left to stand

Dark green ppt goes brown Fe(OH)3

Fe3+(aq) + NH3

Brown ppt Fe(OH)3

V2+ (aq)

Violet solution

V3+ (aq)

Dark Green solution

V4+ (aq)

Pale blue solution

V5+ (aq)

Yellow solution