Reactions of metal ions in aqeous solution

Question 1

Iron (ii) with NaOH

Answer 1

[Fe(H2O)6}2+ + 2OH- –> Fe(H2O)4(OH)2 + 2H2O

Green ppt

Question 2

Iron (ii) with XS NaOH

Answer 2

doesn’t happen

Question 3

Iron (ii) with NH3

Answer 3

[Fe(h2O)6]2+ + 2NH3 –> Fe(H2O)4(OH)2 + 2NH4+

Green ppt

Question 4

Iron (ii) with XS NH3

Answer 4

doesn’t happen

Question 5

Iron (ii) with Na2CO3

Answer 5

[Fe(H2O)6]2+ + CO32- –> FeCO3 +6H2O

green ppt

Question 6

Copper (ii) with NaOH

Answer 6

[Cu(H2O)6]2+ + 2OH- –> Cu(H2O)4(OH)2 + 2H2O

blue ppt

Question 7

Copper (ii) with XS NaOH

Answer 7

doesn’t happen

Question 8

Copper (ii) with NH3

Answer 8

[Cu(H2O)6]2+ +2NH3 –> Cu(H2O)4(OH)2 + 2NH4+

blue ppt

Question 9

Copper (ii) with XS NH3

Answer 9

Cu(H2O)4(OH)2 + 4NH3 –> [Cu(H2O)2(NH3)4]2+ + 2H2O + 2OH-

deep blue solution

Question 10

Copper (ii) with Na2CO3

Answer 10

[Cu(H2O)6]2+ + CO32- –> CuCO3 + 6H2O

blue/green ppt

Question 11

Iron (iii) with NaOH

Answer 11

[Fe(H2O)6]3+ + 3OH- –> Fe(H2O)3(OH)3 + 3H2O

brown ppt

Question 12

Iron (iii) with XS NaOH

Answer 12

doesn’t happen

Question 13

Iron (iii) with NH3

Answer 13

[Fe(H2O)6]3+ + 3NH3 –> Fe(H2O)3(OH)3 + 3NH4+

brown ppt

Question 14

Iron (iii) with XS NH3

Answer 14

doesn’t happen

Question 15

Iron (iii) with Na2CO3

Answer 15

2[Fe(H2O)6]3+ + 3Co32- –> 2Fe(H2O)3(OH)3 + 3CO2 + 3H2O

brown ppt and CO2

Question 16

Aluminium (iii) with NaOH

Answer 16

[Al(H2O)6]3+ + 3OH- –> Al(H2O)3(OH)3 + 3H2O

white ppt

Question 17

Aluminium (iii) with XS NaOH

Answer 17

Al(H2O)3(OH)3 + OH- –> [Al(OH)4]- + 3H2O

colourless solution

Question 18

Aluminium (iii) with NH3

Answer 18

[Al(H2O)6]3+ + 3NH3 –> Al(H2O)3(OH)3 + 3NH4

white ppt

Question 19

Aluminium (iii) with XS NH3

Answer 19

doesn’t happen

Question 20

Aluminium (iii) with Na2CO3

Answer 20

[AL(H2O)6]3+ + CO32- –> AL(H2O)3(OH)3 + 3CO2 + 3H2O

white ppt and CO2