Qualitative Analysis Test For Anions.

Question 1

What are the metal ions you can test for using a flame?

Answer 1

Lithium Li+
Sodium Na+
Potassium K+
Calcium Ca²+
Barium Ba²+
Copper (II) Cu²+

Question 2

What flame color does lithium Li+ have?

Answer 2

Red.

Question 3

What flame color does sodium Na+ have?

Answer 3

Yellow.

Question 4

What flame color does potassium K+ have?

Answer 4

Lilac.

Question 5

What flame color does calcium Ca²+ have?

Answer 5

Orange-red.

Question 6

What flame color does barium Ba²+ have?

Answer 6

Light-green.

Question 7

What flame color does copper (II) Cu²+ have?

Answer 7

Blue-green.

Question 8

What are the anions?

Answer 8

Chloride Cl⁻
Carbonate CO₃²⁻
Bromide Br⁻
Iodide I⁻
Sulfate SO₄²-
Sulfite SO²⁻ ₃
Nitrate NO⁻ ₃

Question 9

How do you test for Chlorine Cl⁻ and what is the test result (anion)?

Answer 9

Acidify with dilute nitric acid, then add aqueous silver nitrate (white ppt).

Question 10

How do you test for Carbonate CO₃²⁻ and what is the test result (anion)?

Answer 10

Add dilute acid, then test for carbon gas (effervescence, carbon dioxide produced).

Question 11

How do you test for Bromide Br⁻ and what is the test result (anion)?

Answer 11

Acidify with dilute nitric acid, then add aqueous silver nitrate (cream ppt).

Question 12

How do you test for Iodide I⁻ and what is the test result (anion)?

Answer 12

Acidify with dilute nitric acid then add aqueous silver nitrate (yellow ppt).

Question 13

How do you test for Sulfate SO₄²- and what is the test result (anion)?

Answer 13

Acidify with nitric acid then add aqueous barium nitrate (white ppt).

Question 14

How do you test for Sulfite SO²⁻ ₃ and what is the test result (anion)?

Answer 14

Add a small volume of acidified aqueous potassium manganate (VII)
(the acidified aqueous potassium manganate (VII) changes color from purple to colorless).

Question 15

How do you test for Nitrate NO⁻ ₃ and what is the test result (anion)?

Answer 15

Add aqueous sodium hydroxide to aluminium foil and warm carefully (ammonia produced).

Question 16

What are the aqueous cations?

Answer 16

Aluminum Al3+
Ammonium NH₄⁺
Calcium Ca²+
Chromium Cr3+
Copper (II) Cu²+
Iron (II) Fe²+
Iron (III) Fe3+
Zinc ²+

Question 17

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Aluminum Al3+ (cation)?

Answer 17

Sodium hydroxide: White ppt, soluble in excess giving a colorless solution.
Ammonia: White ppt, insoluble in excess.

Question 18

What is the effect of aqueous sodium hydroxide on Ammonium NH₄⁺(cation)?

Answer 18

Sodium hydroxide: Ammonia produced on warming.

Question 19

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Calcium Ca²+ (cation)?

Answer 19

Sodium hydroxide: White ppt, insoluble in excess.
Ammonia: no ppt or a very slight white ppt.

Question 20

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Chromium Cr3+ (cation)?

Answer 20

Sodium hydroxide: Green ppt, soluble in excess.
Ammonia: Green ppt, insoluble in excess.

Question 21

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Copper (II) Cu²+ (cation)?

Answer 21

Sodium hydroxide: Light blue ppt, insoluble in excess.
Ammonia: Light blue ppt soluble in excess, giving a dark blue solution.

Question 22

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Iron (II) Fe²+ (cation)?

Answer 22

Sodium hydroxide and Ammonia: Green ppt, insoluble in excess ppt turns brown near the surface on standing.

Question 23

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Iron (III) Fe3+ (cation)?

Answer 23

Sodium hydroxide and Ammonia: Red-brown ppt, insoluble in excess.

Question 24

What is the effect of aqueous sodium hydroxide and aqueous ammonia on Zinc ²+ (cation)?

Answer 24

Sodium hydroxide and Ammonia: White ppt, soluble in excess giving a colorless solution.

Question 25

What are the gases you can test for?

Answer 25

Ammonia NH₃ Carbon Dioxide CO₂ Chlorine Cl₂ Hydrogen H₂ Oxygen O₂ Sulfur Dioxide SO₂

Question 26

What is the test and test result for Ammonia NH₃?

Answer 26

Turns damp red litmus paper blue.

Question 27

What is the test and test result for Carbon Dioxide CO₂?

Answer 27

Turns limewater milky.

Question 28

What is the test and test result for Chlorine Cl₂?

Answer 28

Bleaches damp litmus paper.

Question 29

What is the test and test result for Hydrogen H₂?

Answer 29

Pops with a lighted splint.

Question 30

What is the test and test result for Oxygen O₂?

Answer 30

Relights a glowing splint.

Question 31

What is the test and test result for Sulfur Dioxide SO₂?

Answer 31

Turns acidified aqueous potassium manganate (VII) from purple to colourless.