Reactions of Ions in Aqueous Solution: Colours & Solutions of Products

Question 1

Full table

Answer 1

• https://filestore.aqa.org.uk/resources/chemistry/AQA-7405-REACTIONS-OF-METAL-IONS.PDF

Question 2

Formula and colour of iron(II) aqueous ion

Answer 2

• [Fe(H2O)6]^2+ (aq)

- Green solution

Question 3

Formula and colour of copper(II) aqueous ion

Answer 3

• [Cu(H2O)6]^2+ (aq)

- Blue solution

Question 4

Formula and colour of iron(III) aqueous ion

Answer 4

• [Fe(H2O)6]^3+ (aq)
• Purple solution
• May look yellow-brown due to some [Fe(H2O)5(OH)]^2+(aq)

Question 5

Formula and colour of aluminium(III) aqueous ion

Answer 5

• [Al(H2O)6]^3+ (aq)

- Colourless solution

Question 6

Formula and colour of iron(II), copper(II), iron(III) and aluminium(III) aqueous ions

Answer 6

• Iron(II)

• [Fe(H2O)6]^2+(aq)
• Green solution

• Copper(II)

• [Cu(H2O)6]^2+(aq)
• Blue solution

• Iron(III)

• [Fe(H2O)6]3+(aq)
• Purple solution
• May look yellow-brown due to some [Fe(H2O)5(OH)]2+(aq)

• Aluminium(III)

• [Al(H2O)6]3+(aq)
• Colourless solution

Question 7

Formula and colour of product after reaction of iron(II) with NaOH and excess NaOH

Answer 7

• Action of NaOH

• Fe(H2O)4(OH)2(s)
• Green ppt goes brown on standing in air

• Action of excess of NaOH
- No further change

Question 8

Formula and colour of product after copper(II) reacts with NaOH and excess NaOH

Answer 8

• Action of NaOH

• Cu(H2O)4(OH)2(s)
• Blue ppt

• Action of excess NaOH (aq)
- No further change

Question 9

Formula and colour of product after iron(III) reacts with NaOH and excess NaOH

Answer 9

• Action of NaOH

• Fe(H2O)3(OH)3(s)
• Brown ppt (ppt may look orange-brown)

• Action of excess NaOH(aq)
- No further change

Question 10

Formula and colour of product after aluminium(III) reacts with NaOH and excess NaOH

Answer 10

• Action of NaOH

• Al(H2O)3(OH)3(s)
• White ppt

• Action of excess NaOH (aq)

• [Al(OH)4]–(aq)
• Colourless solution

Question 11

Formulae and colours of products after iron(II), copper(II), iron(III) and aluminium(III) react with NaOH and excess NaOH

Answer 11

https://filestore.aqa.org.uk/resources/chemistry/AQA-7405-REACTIONS-OF-METAL-IONS.PDF

Question 12

Formula and colour of product after iron(II) reacts with NH3 and excess NH3

Answer 12

• Action of NH3 (aq)

• Fe(H2O)4(OH)2(s)
• Green ppt goes brown on standing in air

• Action of excess NH3 (aq)
- No further change

Question 13

Formula and colour of product after copper(II) reacts with NH3 and excess NH3

Answer 13

• Action of NH3 (aq)

• Cu(H2O)4(OH)2(s)
• Blue ppt

• Action of excess NH3 (aq)

• [Cu(H2O)2(NH3)4]^2+(aq)
• Deep blue solution

Question 14

Formula and colour of product after iron(III) reacts with NH3 and excess NH3

Answer 14

• Action of NH3 (aq)

• Fe(H2O)3(OH)3(s)
• Brown ppt (ppt may look orange- brown)

• Action of excess of NH3 (aq)
- No further change

Question 15

Formula and colour of product after aluminium(III) reacts with NH3 and excess NH3

Answer 15

• Action of NH3 (aq)

• Al(H2O)3(OH)3(s)
• White ppt

• Action of excess NH3 (aq)
- No further change

Question 16

Formulae and colour of products after iron(II), copper(II), iron(III) and aluminium(III) react with NH3 and excess NH3

Answer 16

https://filestore.aqa.org.uk/resources/chemistry/AQA-7405-REACTIONS-OF-METAL-IONS.PDF

Question 17

Formula and colour of product after iron(II) reacts with Na2CO3 (aq)

Answer 17

• FeCO3 (s)

- Green ppt

Question 18

Formula and colour of product after copper(II) reacts with Na2CO3 (aq)

Answer 18

• CuCO3 (s)

- Blue-green ppt

Question 19

Formula and colour of product after iron(III) reacts with Na2CO3 (aq)

Answer 19

• Fe(H2O)3(OH)3(s)

- Brown ppt (ppt may look orange-brown) and CO2 gas

Question 20

Formula and colour of product after aluminium(III) reacts with Na2CO3 (aq)

Answer 20

• Al(H2O)3(OH)3(s)

- White ppt and CO2 gas evolved

Question 21

Formula and colour of products after iron(II), copper(II), iron(III) and aluminium(III) react with Na2CO3 (aq)

Answer 21

https://filestore.aqa.org.uk/resources/chemistry/AQA-7405-REACTIONS-OF-METAL-IONS.PDF