2.2.6 aqa ions

Question 1

aqa ion

Answer 1

when 6 h2o ligand form cordinate binds around a transition metal ion

Question 2

why fe a 3+ is more acidic than a 2+

Answer 2

3+ smaller and more highly charged than the 2+ meaning it more strongly polarising
more strongly attracts the electrons from the oxygen atom
weakening the o-h bond
h more easily dissocites

Question 3

aqa ion hydrolysis

Answer 3

behaves a bronstead lowry adid - donates a proiton
3+ becomes 2+
and product of H3O+

Question 4

basic reaction with aqa ions

Answer 4

addition of Oh-
removes a proton
meaning (OH ) releases (H2O)
and charge is dropped by one
happens 3 times in 3+ till 3(h2O) AND 3(OH) - which is uncharged and insoluble ppt do no further reaction

same with 2+ BUT HAPPENS twise and ends 4,2

Question 5

reactions with the carbonate

Answer 5

• doesnt happen with Fe3+ as teh greater acidity

carbonate ion CO32+

can be incomplete reatcion to form a 3,3 and 3HCO3-

then to completion when there is enough of the aqua ion goes to CO2 and H20 and a 3,3

and 2+

Iron(II) and copper(II) react with sodium carbonate as acids forming insoluble carbonates and water