complex ion solution colours Flashcards by flo wood

Q

Cu^2+ in aqueous solution

A

blue

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Q

Fe^2+ in aqueous solution

A

pale green

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Q

Fe^3+ in aqueous solution

A

yellow

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Q

Mn^2+ in aqueous solution

A

pale pink

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Q

Cr^3+ in aqueous solution

A

green

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Q

Cu^2+ in aqueous solution + OH^- / NH3

A

pale blue precipitate

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Q

Fe^2+ in aqueous solution + OH^- / NH3

A

dirty green precipitate

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Q

Fe^3+ in aqueous solution + OH^- / NH3

A

orange precipitate

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Q

Mn^2+ in aqueous solution + OH^- / NH3

A

pink precipitate

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Q

Cr^3+ in aqueous solution + OH^- / NH3

A

green-grey precipitate

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Q

Cu^2+ add excess OH^- to the precipitate

A

no change
insoluble in excess NaOH

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Q

Fe^2+ add excess OH^- to the precipitate

A

no change
insoluble in excess NaOH

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Q

Fe^3+ add excess OH^- to the precipitate

A

no change
insoluble in excess NaOH

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Q

Mn^2+ add excess OH^- to the precipitate

A

no change
insoluble in excess NaOH

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Q

Cr^3+ add excess OH^- to the precipitate

A

dark green solution

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Q

Cu^2+ add excess NH3 to the precipitate

A

dark blue solution
part ligand substitution

Q

Fe^2+ add excess NH3 to the precipitate

A

insoluble in excess NH3
no change

Q

Fe^3+ add excess NH3 to the precipitate

A

insoluble in excess NH3
no change

Q

Mn^2+ add excess NH3 to the precipitate

A

insoluble in excess NH3
no change

Q

Cr^3+ add excess NH3 to the precipitate

A

purple solution