reactions

Question 1

• testing group 2 ions Ba^2+
  reaction with NaOH and then excess NaOH

Answer 1

It stays a colourless solution after Both reactions

Question 2

• testing group 2 ions
  Ca^2+ reaction with NaOH and then excess NaOH

Answer 2

colourless solution to
- having slight white ppt
-having slight white ppt

Question 3

• testing group 2 ions
  Mg^2+ reaction with NaOH and then excess NaOH

Answer 3

colourless solution to
- having slight white ppt
-having white ppt

Question 4

• testing group 2 ions Sr^2+ reaction with NaOH and then excess NaOH

Answer 4

colourless solution to
- having white ppt
-having white ppt

Question 5

• The reactions of metal aqua ions with bases

Fe^2+ reacts with :
OH^ -
NH3
CO3^2-

Answer 5

pale green to:

• Dark green precipitate, insoluble in excess, slowly turns orange-brown at the surface

-Dark green precipitate, insoluble in excess, slowly turns orange-brown

-Green precipitate

Question 6

• The reactions of metal aqua ions with bases

Cu^2+ reacts with :
OH^ -
NH3
CO3^2-

Answer 6

Pale blue to :

• Light blue precipitate, insoluble in excess
• Light blue precipitate, soluble in excess to give a dark blue solution
• Blue precipitate

Question 7

• The reactions of metal aqua ions with bases

Al^3+ reacts with :
OH^ -
NH3
CO3^2-

Answer 7

Colourless to:
- White precipitate, quickly redissolves in excess to give a colourless solution

• White precipitate, insoluble in excess
• White precipitate with some bubbles

Question 8

• The reactions of metal aqua ions with bases

Fe^3+ reacts with :
OH^ -
NH3
CO3^2-

Answer 8

Pale orange to :
- Red-brown precipitate, insoluble in excess
- Red-brown precipitate, insoluble in excess
- Red-brown precipitate with some bubbles