COLOURS OF INORGANIC IONS & COMPLEXES Flashcards by Sreya Wadud

Q

What is the colour of [Cu(H₂O)₆]²⁺

A

pale blue solution

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Q

What is the colour of Cu(OH)_{2 (s)}?

A

pale blue precipitate

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Q

How is Cu(OH)_{2 (s)} formed?

A

Add NH₃ dropwise to Cu²⁺_(aq)

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Q

What is the colour of [Cu(NH₃)₄(H₂O)₂]²⁺?

A

dark blue solution

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Q

How is [Cu(NH₃)₄(H₂O)₂]²⁺ formed?

A

Add excess NH₃ to Cu²⁺_(aq)

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Q

What is the colour of CuCl₄^2-?

A

yellow solution

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Q

How is CuCl₄^2- formed?

A

Add excess HCl to Cu²⁺_(aq)

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Q

What is the colour of Cu⁺?

A

red

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Q

How is Cu⁺ formed?

A

Reduction of Cu²⁺ with I^-

(Cu²⁺ + 3I^- ⟶ CuI_(s) + I_{2 (aq)}, forms white precipitate CuI and brown I₂)

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Q

What colour is Cu²⁺/Cu?

A

pale blue

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Q

What colour is [CoCl₄]^2-?

A

blue solution

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Q

How is [CoCl₄]^2- formed?

A

Add excess HCl to CoCl₂•6H₂O

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Q

What colour is [Cr(H₂O)₆]³⁺?

A

pale purple solution

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Q

What colour is Cr(OH)₃ _(s)?

A

dark green precipitate

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Q

How is Cr(OH)₃ _(s) formed?

A

Add NH₃ dropwise to Cr³⁺_(aq)

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Q

What colour is [Cr(NH₃)₆]³⁺?

A

purple solution

Q

How is [Cr(NH₃)₆]³⁺ formed?

A

Add excess NH₃ to Cr³⁺_(aq)

Q

What colour is [Cr(OH)₆]^3-?

A

dark green solution

Q

What colour is Cr₂O₇^2-?

A

orange solution

Q

How is Cr_²O₇^2- formed?

A

K₂Cr₂O₇ in 1moldm^-3 H₂SO₄

Q

What colour is CrO₄^2-?

A

yellow solution

Q

How is CrO₄^2- formed?

A

Oxidation of Cr³⁺ with hot alkaline H₂O₂

Q

What colour is [Mn(H₂O)₆]²⁺?

A

pale pink solution

Q

What colour is Mn(OH)_{2 (s)}?

A

pale brown precipitate

How is Mn(OH)_{2 (s)} formed?

Add **NaOH dropwise** to Mn²⁺_(aq)

What colour is [Fe(H₂O)₆]²⁺?

pale green solution

What colour is Fe(OH)_{2 (s)}?

dark green precipitate

How is Fe(OH)_{2 (s)} formed?

Add **NaOH dropwise** to Fe²⁺_(aq)

What colour is [Fe(H₂O)₆]³⁺?

yellow

What colour is Fe(OH)_{3 (s)}?

orange-brown precipitate

How is Fe(OH)_{3 (s)} formed?

Add NaOH to Fe3+ dropwise

What is the colour change from MnO^4-/Fe²⁺ to Mn²⁺/Fe³⁺?

purple to pale pink

What is the colour change from I^-/Fe³⁺ to I₂/Fe²⁺?

orange-brown to brown