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GCSE Chemistry > Anion Tests > Flashcards

Anion Tests Flashcards

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1
Q

what type of ions are anions?

A

negative ions e.g. O2-

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2
Q

what is the test for halide ions?

A

Silver Nitrate Test

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3
Q

how do we complete a silver nitrate test?

A
  1. dissolve the sample in water
  2. add nitric acid
  3. add silver nitrate solution
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4
Q

if chloride, bromide, or iodide ions are presented, what will form?

A

a precipitate will form

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5
Q

what is the halide ion of AgCl?

A

Cl-

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6
Q

what is the halide ion of AgBr?

A

Br-

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7
Q

what is the halide ion of AgI?

A

I-

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8
Q

what is the precipitate colour of AgCl?

A

white

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9
Q

what is the precipitate colour of AgBr?

A

cream

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10
Q

what is the precipitate colour of AgI?

A

yellow

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11
Q

what is the equation for the formation of a halide precipitate?

A

Ag+(aq) + Cl-(aq) –> AgCl(s)

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12
Q

why is it important to add nitric acid to the experiment of the Silver Nitrate Test?

A

because Ag+ ions also form precipitates with other anions, so the nitric acid reacts with those anions, preventing false positives

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13
Q

how do we test for a sample of carbonate ions?

A
  1. add hydrochloric acid, look for effervescence
  2. if there is effervescence, bubble the gas through limewater
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14
Q

what would happen to the limewater if carbonate is present in gas?

A

the gas evolved turns the limewater cloudy

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15
Q

why is it important to confirm the gas evolved when testing for carbonates is CO2?

A

because acids also evolve a gas when they react with other things - check using the limewater test

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16
Q

how do you test for sulfate ions?

A
  1. add hydrochloric acid and look for effervescence
  2. if there’s no effervescence, add barium chloride solution
17
Q

what happens if sulfate ions are present?

A

they will form a white precipitate with barium ions

18
Q

why is it important to add hydrochloric acid in step one of testing for sulfates?

A

carbonate ions also form a white precipitate with barium ions - by only continuing to step two if there is no effervescence it prevents a false positive

GCSE Chemistry (46 decks)

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