Reactions of ions in aqueous solutions Flashcards
State what you would observe when NaOH is added to the aqueous ion of Fe (II)
Green ppt formed which goes brown when left standing in air
State what you would observe when NaOH is added to the aqueous ion of Cu (II)
(Light) blue ppt formed
State what you would observe when NaOH is added to the aqueous ion of Fe (III)
Brown ppt formed (may look orange-brown)
State what you would observe when NaOH is added to the aqueous ion of Al (III)
White ppt formed
State what you would observe when NaOH is added to the aqueous ion of Co (II)
(Dark) blue ppt formed
What colour is the solution of the aqueous ion of Fe (II)?
Green
What colour is the solution of the aqueous ion of Fe (III)?
Purple (may look yellow-brown)
What colour is the solution of the aqueous ion of Al (III)?
Colourless
What colour is the solution of the aqueous ion of Cu (II)?
Blue
What colour is the solution of the aqueous ion of Co (II)?
Pink
The aqueous ion of Fe (III) is purple. However, the solution sometimes appears yellow-brown. Why is this?
Some [Fe(H2O)5(OH)2]2+ has been formed
NaOH is added to Fe (I) and a green ppt is formed. Excess NaOH is then added. What will be observed (if anything)?
No further change
NaOH is added to Cu (II) and a blue ppt is formed. Excess NaOH is then added. What will be observed (if anything)?
No further change
NaOH is added to Fe (III) and a brown ppt is formed. Excess NaOH is then added. What will be observed (if anything)?
No further change
NaOH is added to Al (III) and a white ppt is formed. Excess NaOH is then added. What will be observed (if anything)?
Colourless soln. formed (but different complex from original aq ion)
State what you would observe when NH3 is added to the aqueous ion of Fe (II)
Green ppt formed which goes brown on standing in air
State what you would observe when NH3 is added to the aqueous ion of Cu (II)
(Light) blue ppt formed
State what you would observe when NH3 is added to the aqueous ion of Fe (III)
Brown ppt (may look orange-brown)
State what you would observe when NH3 is added to the aqueous ion of Al (III)
White ppt formed
State what you would observe when excess NH3 is added to the aqueous ion of Co (II)
Pale brown soln. formed
NH3 is added to Fe (II) and a green ppt is formed. Excess NH3 is then added. What will be observed (if anything)?
No further change
NH3 is added to Cu (II) and a blue ppt is formed. Excess NH3 is then added. What will be observed (if anything)?
Deep blue soln. formed
NH3 is added to Fe (III) and a brown ppt is formed. Excess NH3 is then added. What will be observed (if anything)?
No further change
NH3 is added to Al (III) and a white ppt is formed. Excess NH3 is then added. What will be observed (if anything)?
No further change
State what you would observe when Na2CO3 is added to the aqueous ion of Fe (II)
(Light) green ppt formed
State what you would observe when Na2CO3 is added to the aqueous ion of Cu(II)
Blue-green ppt formed
State what you would observe when Na2CO3 is added to the aqueous ion of Fe (III)
Brown ppt formed (may look orange brown)
CO2 gas released
State what you would observe when Na2CO3 is added to the aqueous ion of Al (III)
White ppt
CO2 gas evolved
State what you would observe when Na2CO3 is added to the aqueous ion of Co (II)
Purple ppt formed
State what you would observe when HCl is added to the aqueous ion of Cu (II)
Yellow soln. formed (may look green)
State what you would observe when HCl is added to the aqueous ion of Co (II)
Blue soln. formed
A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A yellow soln. is formed. What is the oxidation state of vanadium?
V (V)
A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A blue soln. is formed. What is the oxidation state of vanadium?
4
A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A green soln. is formed. What is the oxidation state of vanadium?
V (III)
A soln. of ammonium vanadate (V) (NH4VO3) is reduced by zinc under acidic conditions. A violet/purple soln. is formed. What is the oxidation state of vanadium?
V (II)
V (II) forms what colour solution?
Violet/purple
V (III) forms what colour solution?
Green
V (IV) forms what colour solution?
Blue
V (V) forms what colour solution?
Yellow
Which is more acidic of M3+ and M2+ and why? (M=metal)
M3+
It has a greater polarising power as it is smaller and has a greater charge than M2+
This means the O-H bond breaks more easily and so more H+ are released
