precipitation reactions

Question 1

Cu +2 ion colour

Answer 1

blue solution

Question 2

Cu +2 colour with NaOH

Answer 2

a blue precipitate forms and is insoluble in excess

Question 3

Cu +2 colour with ammonia

Answer 3

light blue precipitate forms, a deep blue solution forms in excess ammonia as the precipitate is soluble

Question 4

Copper (II) ionic equation with OH-

Answer 4

Cu 2+ (aq) + 2OH- (aq) —–> Cu(OH)2 (s)

Question 5

Copper (II) equation with ammonia

Answer 5

[Cu(H2O)6] 2+ (s) +4NH3 (aq) —–> [Cu(H2O)2(NH3)4] 2+ (aq) + 4H2O (l)