Reactions of Ions in Aqueous Solutions

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

State what is meant by a metal-aqua complex.

Back (Answer)

a complex formed when a transition metal is forms co-ordinate bonds to water ligands

Front (Question)

State the colour of the [Fe(H₂O)₆]²⁺ ion in solution.

Back (Answer)

green sol

Front (Question)

State the colour of the [Cu(H₂O)₆]²⁺ ion in solution.

Back (Answer)

blue

Front (Question)

State the colour of the [Fe(H₂O)₆]³⁺ ion in solution.

Back (Answer)

yellow sol

Front (Question)

State the colour of the [Al(H₂O)₆]³⁺ ion in solution.

Back (Answer)

colourless solution

Front (Question)

Explain why a 3+ metal aqua ion is more acidic than a 2+ one.

Back (Answer)

→ higher charge density so greater polarising power → therefore attracts water molecule more strongly & weakens O-H bond → breaking more easily & releasing H+ ions

Front (Question)

State the colour and formula of the [Fe(H₂O)₆]²⁺ ion in NaOH.

Back (Answer)

Fe(H₂O)₄(OH)₂ green ppt

Front (Question)

State the colour and formula of the [Cu(H₂O)₆]²⁺ ion in NaOH.

Back (Answer)

Cu(H₂O)₄(OH)₂ blue ppt

Front (Question)

State the colour and formula of the [Fe(H₂O)₆]³⁺ ion in NaOH.

Back (Answer)

Fe(H₂O)₃(OH)₃ brown ppt

#10

Front (Question)

State the colour and formula of the [Al(H₂O)₆]³⁺ ion in NaOH.

Back (Answer)

Al(H₂O)₃(OH)₃ white ppt

#11

Front (Question)

State the colour and formula of the [Al(H₂O)₆]³⁺ ion in excess NaOH.

Back (Answer)

[Al(OH)₄]⁻ colourless solution

#12

Front (Question)

State the colour and formula of the [Fe(H₂O)₆]²⁺ ion in NH₃.

Back (Answer)

Fe(H₂O)₄(OH)₂ green ppt

#13

Front (Question)

State the colour and formula of the [Fe(H₂O)₆]³⁺ ion in NH₃.

Back (Answer)

Fe(H₂O)₃(OH)₃ brown ppt

#14

Front (Question)

State the colour and formula of the [Cu(H₂O)₆]²⁺ ion in NH₃.

Back (Answer)

Cu(H₂O)₄(OH)₂ blue ppt

#15

Front (Question)

State the colour and formula of the [Al(H₂O)₆]³⁺ ion in NH₃.

Back (Answer)

Al(H₂O)₃(OH)₃ white ppt

#16

Front (Question)

State the colour and formula of the [Cu(H₂O)₆]²⁺ ion in excess NH₃.

Back (Answer)

[Cu(H₂O)₂(NH₃)₄]²⁺ deep blue solution

#17

Front (Question)

State the colour and formula of the [Cu(H₂O)₆]²⁺ ion in concentrated HCl.

Back (Answer)

[CuCl₄]²⁻ green-yellow solution

#18

Front (Question)

What do X²⁺ ions form when reacted with carbonate solution?

Back (Answer)

XCO₃

#19

Front (Question)

What do X³⁺ ions form when reacted with carbonate solution?

Back (Answer)

X(OH)₃(H₂O)₃ + 3CO₂ + 3H₂O

#20

Front (Question)

State the colour and formula of the [Cu(H₂O)₆]²⁺ ion when it reacts with sodium carbonate.

Back (Answer)

CuCO₃ green-blue ppt

#21

Front (Question)

Describe the appearance of CoCO3

Back (Answer)

purple solid

#22

Front (Question)

State colour and appearance of [Fe(H₂O)₆]³ with Na2CO3

Back (Answer)

Fe(H₂O)₃(OH)₃ brown ppt

#23

Front (Question)

Reactions with sodium hydroxide

Back (Answer)

All four metals will ppt, only aluminium hydroxide will dissolve in excess- due to amphoteric

#24

Front (Question)

Reaction with ammonia

Back (Answer)

All four metal will form ppt, only copper hydroxide will dissolve in excess due to ligand sub