Chemical Tests For Cations

Question 1

Aluminium

Answer 1

• Al3+
• AQSH: white ppt, soluble in excess - colourless solution.
• AQA: white ppt, insoluble in excess.

Question 2

Ammonium

Answer 2

• NH+4

- AQSH:ammonia in warming.

Question 3

Calcium

Answer 3

• Ca2+
• AQSH: white ppt, insoluble in excess.
• AQA: no ppt/slight white ppt.

Question 4

Chromium

Answer 4

• Cr3+
• AQSH: green ppt, soluble in excess.
• AQA: grey/green ppt, insoluble in excess.

Question 5

Copper (II)

Answer 5

-Cu2+
-AQSH: light blue ppt, indoluble in excess.
AQA: light blue, insoluble in excess, giving a dark blue solution.

Question 6

Iron (II)

Answer 6

• Fe2+
• AQSH: green ppt, insoluble in excess.
• AQA: green ppt, insoluble in excess.

Question 7

Iron (III)

Answer 7

• Fe3+
• AQSH: red/brown ppt, insoluble in excess.
• AQA: red/brown ppt, insoluble in excess.

Question 8

Zinc

Answer 8

• Zn2+
• AQSH: white ppt, soluble in excess, giving a colourless solution.
• AQA: white ppt, soluble in excess - colourless.