15.10 reaction of transition metal ions with aq. alkalis Flashcards by ヤブキ千秋

Q

Cu2+ in aq. solution

A

blue

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Q

Fe2+ in aq. solution

A

pale green

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Q

Fe3+ in aq. solution

A

yellow

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Q

Co2+ in aq. solution

A

pink

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Q

Cr3+ in aq. solution

A

green

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Q

Cu2+ with added alkali

A

pale blue ppt
Cu(OH)2(H2O)4

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Q

Fe2+ with added alkali

A

dirty green ppt
Fe(OH)2(H2O)4

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Q

Fe3+ with added alkali

A

orange ppt
Fe(OH)3(H2O)3

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Q

Co2+ with added alkali

A

blue ppt
Co(OH)2(H2O)4

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Q

Cr3+ with added alkali

A

green ppt
Cr(OH)3(H2O)3

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Q

Cu2+ with excess alkali

A

insoluble (pale blue ppt)

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Q

Fe2+ with excess alkali

A

insoluble (dirty green ppt)

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Q

Cr3+ with excess alkali

A

green sol.
[Cr(OH)6]3-

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Q

Fe3+ with excess alkali

A

insoluble (orange ppt)

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Q

Co2+ with excess alkali

A

insoluble (blue ppt)

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Q

Cu2+ with excess NH3

A

dark blue sol.
[Cu(NH3)4(H2O)2]2+

Q

Cr3+ with excess NH3

A

purple sol.

Q

Fe2+ with excess NH3

A

insoluble (dirty green ppt)

Q

Fe3+ with excess NH3

A

insoluble (orange ppt)

Q

Co3+ with excess NH3

A

pale yellow sol.
[Co(NH3)6]2+

Q

which hydroxide is classified as amphoteric? why?

A

Cr(H2O)3(OH)3
- react & dissolve in both acid & base

Q

[CuCl4]2-

A

yellow