identifying anions

Question 1

test for carbonate (CO₃²⁻)

Answer 1

add dilute acid and test the related gas

Question 1

positive results for carbonate (CO₃²⁻)

Answer 1

• C02 released
• Turns limewater milky

Question 2

test for chloride (Cl−)

Answer 2

acidify with dilute nitric acid & add aqueous silver nitrate

Question 3

positive results for chloride (Cl−)

Answer 3

white precipitate formed

Question 4

test for bromide (Br−)

Answer 4

acidify with dilute nitric acid & add aqueous silver nitrate

Question 5

positive results for bromide (Br−)

Answer 5

cream precipitate formed

Question 6

test for iodide (I-)

Answer 6

acidify with dilute nitric acid & add aqueous silver nitrate

Question 7

positive test for iodide (I-)

Answer 7

yellow precipitate formed

Question 8

test for nitrate (NO3)

Answer 8

add NaOH and aluminium foil , warm gently and test released gas

Question 9

positive test for nitrate (NO3)

Answer 9

• ammonia released
• pungent smell
• turns moist red litmus paper blue

Question 10

test for sulfate [SO4]2−

Answer 10

acidify with dilute nitric acid and add aqueous barium nitrate

Question 11

positive test for sulfate [SO4]2−

Answer 11

white precipitate formed

Question 12

test for sulfite [SO3]2−

Answer 12

add dilute sulfuric acid, warm gently and test the gas released

Question 13

positive test for sulfite [SO3]2−

Answer 13

• So2 (sulfur dioxide) related
• turns purple potassium magnate iiv colourless