QA Test for Anions Flashcards

1
Q

Method for NO3- (nitrate)

A
  1. Add dilute NaOH (aq)
  2. Add a piece of aluminium foil/powder
  3. Warm mixture and test gas liberated (NH3) with a piece of moist red litmus paper
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2
Q

Observation for NO3- (nitrate)

A

Ammonia is liberated; moist red litmus paper turns blue

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3
Q

Method for CO3 2- (carbonate)

A
  1. Add dilute HCl/any acid
  2. Bubble gas into limewater
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4
Q

Observation for CO3 2- (carbonate)

A

Carbon dioxide is liberated; effervescence is produced, white precipitate is formed in limewater

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5
Q

Method for Cl- (chloride)

A
  1. Add dilute nitric acid
  2. Add silver/lead (II) nitrate
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6
Q

Observation for Cl- (chloride)

A

White precipitate of silver/lead (II) chloride is formed

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7
Q

Method for I- (iodide)

A
  1. Add dilute nitric acid
  2. Add silver/lead (II) nitrate
    (Same as chloride)
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8
Q

Observation for I- (iodine)

A

Yellow precipitate of silver/lead (II) iodide formed

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9
Q

Method for SO4 2- (sulfate)

A
  1. Add dilute nitric acid
  2. Add barium/ calcium chloride/ nitrate
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10
Q

Observation for SO4 2- (sulfate)

A

White precipitate of barium/calcium sulfate is formed

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