identify metal ions

Question 1

1/ Effect of adding Ammonium to -NaOH-

Answer 1

• Effect of adding NaOH:
  »> ammonia is produced if warmed

Question 2

Effect of adding Calcium to -NaOH-

Answer 2

• Effect of adding NaOH:
  »> white ppt
• “insoluble” in “excess NaOH”

Question 3

3. Effect of adding Chromium (III) to -NaOH-

Answer 3

• Effect of adding NaOH:
  »> “green ppt”
  -> grey-green ppt, insoluble in excess

Question 4

4. Effect of adding copper (II) -NaOH-

Answer 4

• Effect of adding NaOH:
  »> light blue ppt, insoluble in excess

Question 5

Iron (II) in NaOH and ammonia

Answer 5

• Effect of adding NaOH + Effect of adding ammonia solution:
  »> “green ppt”
• “insoluble” in excess

Question 6

Iron (III) in NaOH and ammonia

Answer 6

• Effect of adding NaOH + Effect of adding ammonia solution:
  »> “Red-Brown ppt”
• “insoluble” in excess in NaOH and ammonia

Question 7

Zinc in NaOH and ammonia

Answer 7

• Effect of adding NaOH + Effect of adding ammonia solution:
  »> white ppt
  +) soluble in excess -> giving a colorless solution

Question 8

Effect of adding copper (II) to -ammonia solution-

Answer 8

• Effect of adding ammonia solution:
  »> Light blue ppt
  +) soluble to excess -> give a dark blue soultion

Question 9

Effect of adding Chromium (III) to -ammonia solution-

Answer 9

• Effect of adding ammonia solution:
  -> dark greeen ppt -> insoluble in excess

Question 10

3/ Effect of adding Calcium to -ammonia solution-

Answer 10

• Effect of adding ammonia solution:
  -> no ppt or slightly white ppt

Question 11

4/ Effect of adding Ammonium to -ammonia solution-

Answer 11

• Effect of adding ammonia solution:
  »> “nothing happens”