reaction of aqueous ions

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

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Front (Question)

write the formula of a metal aqua ion (2+ and 3+ charges)

Back (Answer)

[M(H2O)6] 2+ [M(H2O)6] 3+

Front (Question)

why are aqueous metal ions acidic

Back (Answer)

• the aqueous metal ion is polarising • pulls electron density off H2O ligands • weakens O-H bond (water ligands can be deprotonated

Front (Question)

how many water ligands are deprotonated for 2+ and 3+ metal aqua ions

Back (Answer)

2 for 2+ ions and 3 for 3+ ions

Front (Question)

explain why deprotonated metal aqua ions are insoluble

Back (Answer)

they have no overall charge

Front (Question)

explain why [M(H2O)6] 3+ ions are more acidic than [M(H2O)6] 2+ ions

Back (Answer)

smaller and more highly charged so has high charge density so very polarising so pulls more electron density off of water ligands easier to deprotonate water ligands in 3+ ions

Front (Question)

write an equation for the reaction of aqueous Cu2+ ions with NaOH

Back (Answer)

[Cu(H2O)6] 2+ + 2OH- —> Cu(H2O)4 (OH)2 + 2H2O

Front (Question)

write an equation for the reaction of aqueous Co3+ with dilute NH3

Back (Answer)

[Co (H20)6 ] 3+ + 3NH3 —> CO (H2O)3 (OH) 3 (s) + 3NH4+

Front (Question)

what is the colour of aqueous [Cu (H20)6 ] 2+ ions

Back (Answer)

blue solution

Front (Question)

what is colour of aqueous [Fe (H20)6 ] 2+ ions

Back (Answer)

green solution

#10

Front (Question)

what is the colour of aqueous [ Fe (H20)6 ] 3+ ions

Back (Answer)

brown/purple solution

#11

Front (Question)

what is the colour of aqueous [Al (H20)6 ] 3+ ions

Back (Answer)

colourless solution

#12

Front (Question)

write the simplest ionic equation for the reaction of [M (H20)6 ] 2+ ions with sodium hydroxide solution

Back (Answer)

[M (H20)6 ] 2+ (aq) + 2OH- (aq) —-> M (H2O)4 (OH)2 (s) + 2H2O (l)

#13

Front (Question)

write the simplest ionic equation for the reaction of [M (H20)6 ] 3+ ions with sodium hydroxide solution

Back (Answer)

[M (H20)6 ] 3+ (aq) + 3OH- (aq) —-> M (H2O)3 (OH)3 (s) + 3H2O (l)

#14

Front (Question)

give an observation when Fe2+ (aq) reacts with NaOH

Back (Answer)

green solution –> green ppt —> turns into brown ppt when in air due to oxidation with oxygen to Fe3+

#15

Front (Question)

give an observation when Cu2+ (aq) reacts with NaOH

Back (Answer)

blue solution —> blue ppt

#16

Front (Question)

give an observation when Fe3+ (aq) reacts with NaOH

Back (Answer)

brown/purple solution —> brown ppt

#17

Front (Question)

give an observation when Al3+ (aq) reacts with NaOH

Back (Answer)

colourless solution —> white ppt

#18

Front (Question)

write the simplest ionic equation for the reaction of [M (H2O)6 ] 2+ ions with ammonia solution

Back (Answer)

[M (H2O)6 ] 2+ (aq) + 2NH3 (aq) —> M (H20)4 (OH)2 (s) + 2NH4+ (l)

#19

Front (Question)

write the simplest ionic equation for the reaction of [M (H2O)6 ] 3+ ions with ammonia solution

Back (Answer)

[M (H2O)6 ] 3+ (aq) + 3NH3 (aq) —> M (H20)3 (OH)3 (s) + 3NH4+ (l)

#20

Front (Question)

what happens when excess ammonia is reacted with Cu2+ (aq) and give equation for the reaction

Back (Answer)

blue ppt —> royal blue solution [Cu (H2O)6] 3+ (aq) + 4NH3 —> [Cu (H2O)2 (NH3)4 ] 2+ due to a ligand displacement reaction

#21

Front (Question)

Write the simplest ionic equation for the reaction of [M (H2O)6 ] 3+

Back (Answer)

2 [M(H2O)6 ] 3+ (aq) + 3CO3 2- (aq) ——> 2M (H2O)3 (OH)3 (s) + 3H2O + 3CO2

#22

Front (Question)

What observation is made when M3+ ions react with sodium carbonate solution

Back (Answer)

Bubbles/ effervescence due to CO2 production

#23

Front (Question)

Explain why [M (H2O)6 ]2+ ions do not react with sodium carbonate solution

Back (Answer)

[M (H2O)6 ] 2+

#24

Front (Question)

Why can Al(OH)3 be described as amphoteric

Back (Answer)

Acts as both an acid and a base