Reactions of metal ions in aqueous solution

Question 1

Aqueous Fe2+ ions with NaOH

Answer 1

Forms green precipitate of Fe(H2O)4(OH)2 that goes brown on standing in air

Question 2

Aqueous Fe2+ ions with NH3

Answer 2

Forms green precipitate of Fe(H2O)4(OH)2 that goes brown on standing in air

Question 3

Aqueous Fe2+ ions with sodium carbonate

Answer 3

Forms green precipitate of FeCO3

Question 4

Aqueous Cu2+ ions with NH3

Answer 4

Forms blue precipitate of Cu(H2O)4(OH)2 followed by deep blue solution of Cu(H2O)2(NH3)4 2+

Question 5

Aqueous Fe3+ ions with NaOH

Answer 5

Forms brown precipitate of Fe(H2O)3(OH)3

Question 6

Aqueous Fe3+ ions with Na2CO3

Answer 6

Forms brown ppt of Fe(H2O)3(OH)3 and CO2 gas

Question 7

Aqueous Cu2+ ions with HCl

Answer 7

Forms a yellow solution of CuCl4 2-

Question 8

Colour of [Co(H20)6]2+

Answer 8

Pink

Question 9

Colour of [Co(NH3)6]2+

Answer 9

Straw

Question 10

Colour of V2+

Answer 10

Purple

Question 11

Colour of V3+

Answer 11

Green

Question 12

Colour of VO2+ (IV)

Answer 12

Blue

Question 13

Colour of VO2 +(V)

Answer 13

Yellow

Question 14

Colour of [Mn(H20)6]2+

Answer 14

Pale pink