2.6 reactions of ions in aqueous solution

Question 1

what happens in a hydrolysis reaction of a M2+ ion

Answer 1

1+ ion is formed and H3O+

Question 2

solubility of metal(II) and metal (III) hydroxides

Answer 2

both hydroxides are insoluble so form precipitates

Question 3

describe acidity of aqueous ions solutions

Answer 3

the higher the charge of the ion, the more acidic as there is a stronger pull between the oxygen and the electrons weakining the O-H bond

Question 4

test tube reaction of Fe2+, Cu2+, Fe3+ and Al 3+ with OH- and NH3

Answer 4

Fe2+ = green solution to green precipitate
Cu2+ = blue solution to blue precipitate
Fe3+ = yellow solution to brown precipitate
Al3+ = colourless solution to white precipitate

Question 5

test tube reaction of Al3+ with excess OH-

Answer 5

redisolves from a white precipitate to a colourless solution

Question 6

test tube reaction of Cu2+ with excess NH3

Answer 6

blue precipitate to a dark blue precipitate

Question 7

test tube reaction of Fe2+, Cu2+, Fe3+ and Al3+ with NaCO3

Answer 7

Fe2+ = green solution to green precipitate
Cu2+ = blue solution to blue precipitate
Fe3+ = yellow solution to brown precipitate with fizzing
Al3+ = colourless solution to white precipitate