17B.2 Flashcards

1
Q

what is the colour of [Co(H2O)6]^2

A

pale pink solution

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2
Q

what is the colour of [Co(H2O)4(OH)2]

A

Blue precipitate

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3
Q

what is the colour of [Co(NH3)6]^2+

A

pale yellow

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4
Q

what is the reaction, reaction type, colour change when aq sodium hydroxide is added to [Co(H2O)6]^2+

A

page 201

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5
Q

what is the reaction, reaction type, colour change when aq ammonia is added in excess is added to [Co(H2O)6]^2+

A

page 201

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6
Q

what happens when we leave [Co(NH3)6]^2+ out in the air

A

the Cobalt will be oxidized by oxygen in the air from 2+ to 3+ making the pale yellow solution turn darker yellow as [Co(NH3)6]^3+ ions forms

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7
Q

why does the complex [Co(NH3)6]^3+ colour look brown

A

this is because other products form from ligand exchange reaction with both water and any negative ions present

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8
Q

what is the colour of [CoCl4]^-2 complex

A

blue

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9
Q

what is the reaction, reaction type, colour change when CONCENTRATED HCl is added to [Co(H2O)6]^2+

A

page 202

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10
Q

what is the reaction, reaction type, colour change when aq sodium hydroxide is added to [Fe(H2O)6]^2+

A

page 202

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11
Q

what is the reaction, reaction type, colour change when aq ammonia is added to [Fe(H2O)6]^2+

A

page 202

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12
Q

what happens when [Fe(H2O)4(OH)2]is left in the air

A

it gets oxidized (Fe2+ to Fe3+) and the green precipitate colour changes into brown forming [Fe(H2O)3(OH)3]

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13
Q

[Fe(H2O)3(OH)3] is what colour

A

brown precipitate

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14
Q

[Fe(H2O)6}^3+ is what colour

A

yellow-brown

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15
Q

what is the reaction, reaction type, colour change when aq OH is added to [Fe(H2O)6]^3+

A

page 202

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16
Q

what is the reaction, reaction type, colour change when aq ammonia is added to [Fe(H2O)6]^3+

A

202

17
Q

If excess ammonia and Oh is added to [Fe(H2O)6]^3+ what will happen

A

nothing will happen

18
Q

atmospheric complexes occur for transition metal ions with the oxidation number of

A

2+ but not 3+