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A2 Chemistry 2 > Colours > Flashcards

Colours Flashcards

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1
Q

What is the colour of Cr3+ in aqueous solution?

A

Violet

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2
Q

What is the colour of Mn2+ in aqueous solution?

A

Very pale pink

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3
Q

What is the colour of Fe2+ in aqueous solution?

A

Pale blue-green

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4
Q

What is the colour of Fe3+ in aqueous solution?

A

Yellow

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5
Q

What is the colour of Ni2+ in aqueous solution?

A

Emerald green

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6
Q

What is the colour of Cu2+ in aqueous solution?

A

Blue

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7
Q

What happens when NaOH is added to Cr3+?

A

Blue-violet precipitate
Cr(H2O)3(OH)2
Dissolves in excess to green solution containing [Cr(H2O)2(OH)4]-

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8
Q

What happens when NaOH is added to Mn2+?

A

White precipitate
Turns brown in air
Mn(OH)2
Insoluble in excess

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9
Q

What happens when NaOH is added to Fe2+?

A

Pale green precipitate
Turns brown in air
Fe(OH)2
Insoluble in excess

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10
Q

What happens when NaOH is added to Fe3+?

A

Reddish-brown precipitate
Fe(H2O)3(OH)3
Insoluble in excess

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11
Q

What happens when NaOH is added to Ni2+?

A

Emerald green precipitate
Ni(OH)2
Insoluble in excess

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12
Q

What happens when NaOH is added to Cu2+?

A

Blue precipitate
Cu(OH)2
Insoluble in excess

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13
Q

What happens when aqueous ammonia is added to Cr3+?

A

Blue violet precipitate
Cr(H2O)3(OH)3
Dissolves in excess to yellow solution containing [Cr(NH3)6]3+

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14
Q

What happens when aqueous ammonia is added to Mn2+?

A

White precipitate
Turns brown in air
Mn(OH)2
Insoluble in excess

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15
Q

What happens when aqueous ammonia is added to Fe2+?

A

Pale green precipitate
Turns brown in air
Fe(OH)2
Insoluble in excess

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16
Q

What happens when aqueous ammonia is added to Fe3+?

A

Reddish brown precipitate
Fe(H2O)3(OH)3
Insoluble in excess

17
Q

What happens when aqueous ammonia is added to Ni2+?

A

Emerald green precipitate
Ni(OH)2
Dissolves in excess to lavender blue solution
[Ni(NH3)6]2+

18
Q

What happens when aqueous ammonia is added to Cu2+?

A

Blue precipitate
Cu(OH)2
Dissolves in excess to deep blue solution
[Cu(NH3)4(H2O)2]2+

A2 Chemistry 2 (5 decks)

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