Reactions of Transition Metals Match up Game

What reaction takes place when

[Cu(H2O)6]2+ is added to conc HCl? What would you observe?

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

Blue solution -> Green/yellow

What reaction takes place when NaOH is added to [Cu(H2O)6]2+? What would you observe?

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

Blue solution -> Blue precipitate

What reaction takes place when dilute NH3 is added to [Cu(H2O)6]2+? What would you observe?

[Cu(H2O)6]2+ + 2NH3 -> Cu(H2O)4(OH)2 + 2NH4+

Blue solution -> Blue precipitate

What reaction takes place when an excess of NH3 is added to Cu(H2O)4(OH)2? What would you observe?

Cu(H2O)4(OH)2 + 4NH3 -> Cu(NH3)4(OH)2 + 4H2O

Blue precipitate -> Deep blue solution

What reaction takes place when Na2CO3 is added to [Cu(H2O)6]2+? What would you observe?

[Cu(H2O)6]2+ + CO32- -> CuCO3 + 6H2O

Blue solution -> Green precipitate

What reaction takes place when conc NH3 is added to [Co(H2O)6]2+? What would you observe?

[Co(H2O)6]2+ + 6NH3 -> [Co(NH3)6]2+ + 6H2O

Pink -> pale brown solution

What reaction takes place when NaOH is added to [Co(H2O)6]2+? What would you observe?

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

Pink solution -> Blue precipitate

What reaction takes place when conc HCl is added to [Co(H2O)6]2+ ? What would you observe?
[Co(H2O)6]2+ + 4Cl -> [Co(Cl)4]2- + 6H2O Pink solution -> blue solution
What reaction takes place when H2O2 is added to [Co(NH3)6]2+? What would you observe?

[Co(NH3)6]2+ -> [Co(NH3)6]3+

Pale brown solution -> Dark brown solution

What reaction takes place when Na2CO3 is added to CoCl2 and what is observed?

[Co(H2O)6]2+ + CO32- -> CoCO3 + 6H2O

Pink solution -> purple precipitate

What reaction takes place when Na2CO3 is added to [Fe(H2O)6]2+? What would you observe?

[Fe(H2O)6]2+ + CO32- -> FeCO3 + 6H2O

Green solution -> Green precipitate

What reaction takes place when Na2CO3 is added to [Fe(H2O)6]3+? What would you observe?

2[Fe(H2O)6]3+ + 3CO32- -> 2Fe(H2O)3(OH)3 + 3CO2 + 3H2O

Brown solution -> Brown precipitate + effervescence

What reaction takes place when dilute NaOH is added to [Fe(H2O)6]2+? What would you observe?

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

Green solution -> Green precipitate

What reaction takes place when dilute NaOH is added to [Cr(H2O)6]3+? What would you observe?

[Cr(H2O)6]3+ + 3OH- -> Cr(H2O)3(OH)3 + 3H2O

Ruby solution -> Green precipitate

What reaction takes place when excess NaOH is added to [Cr(H2O)6]3+? What would you observe?

[Cr(H2O)6]3+ + 4OH- -> [Cr(H2O)2(OH)4]- + 4H2O

Ruby solution -> Green solution

What reaction takes place when H2O2 is added to [Cr(H2O)2(OH)4]-? What would you observe?
[Cr(H2O)2(OH)4]- + 2H202 -> CrO42- 6H2O Green solution -> Yellow solution
What reaction takes place when dilute NH3 is added to [Al(H2O)6]3+? What would you observe?

[Al(H2O)6]3+ + 3NH3 -> Al(H2O)3(OH)3 + 3NH4+

Colourless solution -> White precipitate

What reaction takes place when excess NaOH is added to [Al(H2O)]3+? What would you observe?

[Al(H2O)6]3+ + 3OH -> Al(H2O)3(OH)3 +3H2O

Colourless -> White precipitate

Al(H2O)3(OH)3 + 2OH -> [Al(H2O)2(OH)4] + H2O + 2OH

White precipitate -> colourless

What reaction takes place when dilute NH3 is added to [Ag(H2O)2]+? What would you observe?
[Ag(H2O)2]+ + NH3 -> Ag(H2O)(OH) + NH4+
Colourless solution -> White precipitate
What reaction takes place when [M(H2O)6]2+ is added to dilute NaOH?
[M(H2O)6]2+ + 2OH- -> M(H2O)4(OH)2 + 2H20
What reaction takes place when [M(H2O)6]3+ is added to dilute NaOH?
[M(H2O)6]3+ + 3OH- -> M(H2O)3(OH)3 + 3H20
What reaction takes place when [M(H2O)6]2+ is added to dilute NH3?
[M(H2O)6]2+ + 2NH3 -> M(H2O)4(OH)2 + 2NH4+
What reaction takes place when [M(H2O)6]3+ is added to dilute NH3?
[M(H2O)6]3+ + 3NH3 -> M(H2O)3(OH)3 + 3NH4+
What reaction takes place when [M(H2O)6]3+ is added to conc NaOH?
[M(H2O)6]3+ + 4OH- -> [M(H2O)2(OH)4]- + 4H20 (Chromium only) [M(H2O)6]3+ + 4OH- -> [M(OH)4]- + 6H20 (Aluminum only)
What reaction takes place when [M(H2O)6]2+ is added to conc NH3?
[M(H2O)6]2+ + 6NH3 -> [M(NH3)6]2+ + 6H2O (Cobalt only)
[M(H2O)6]2+ + 4NH3 -> M(NH3)4(H2O)2 + 4H2O (Copper only)
What reaction takes place when [M(H2O)6]3+ is added to conc NH3?
[M(H2O)6]3+ + 6NH3 -> [M(NH3)6]3+ + 6H2O (Chromium only)
What reaction takes place when [M(H2O)6]2+ is added to Na2CO3?
[M(H2O)6]2+ + CO32- -> MCO3 + 6H2O
What reaction takes place when [M(H2O)6]3+ is added to Na2CO3?
2[M(H2O)6]3+ + 3CO32- -> 2M(H2O)3(OH)3 + 3H20 + 3CO2
What reaction takes place when [M(H2O)6]2+ is added to HCl?
[M(H2O)6]2+ + 4Cl- -> [M(Cl)4]2- + 6H2O
What reaction takes place when H2O2 is added to Co(H2O)4(OH)2 (or Co(H2O)4(OH)2 is left in air)? What would you observe?
Co(H2O)4(OH)2 -> Co(H2O)3(OH)3
Blue precipitate -> Beige precipitate

What transition metal forms this complex with excess NaOH:

[M(H2O)2(OH)4]

Chromium

Which transition metal forms this complex with excess NaOH:

[M(OH)4]-

Aluminum

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