Cations with sodium hydroxide

Question 1

Copper with sodium hydroxide

Answer 1

light blue precipitate

Cu^2+ (aq) + 2OH- (aq) —> Cu(OH)2(s)

Question 2

Iron (III) with sodium hydroxide

Answer 2

Red Brown precipitate

Fe^3+ (aq) + 3OH-(aq) —> Fe(OH)3(s)

Question 3

Chromium (III) with sodium hydroxide

Answer 3

Green Precipitate

Soluble in excess

Cr^3+(aq) + 3OH-(aq) —> Cr(OH)3(s)

Question 4

Iron (II) with sodium hydroxide

Answer 4

Green Precipitate

Insoluble in excess

Fe^2+(aq) + 2OH-(aq) —> Fe(OH)2(s)

Question 5

Ammonium with sodium hydroxide

Answer 5

No precipitate - ammoniA produced

Question 6

Calcium with sodium hydroxide

Answer 6

White Precipitate

Insoluble in excess

Ca^2+(aq) + 2OH-(aq) —> Ca(OH)2(s)

Question 7

Aluminium with sodium hydroxide

Answer 7

White precipitate

Soluble in excess giving a colourless solution

Al^3+(aq) + 3OH-(aq) —> Al(OH)3(s)

Question 8

Zinc with sodium hydroxide

Answer 8

White precipitate

Soluble in excess giving a colourless solution

Zn^2+(aq) + 2OH-(aq) —> Zn(OH02(s)