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chemistry > Quantitative Analysis > Flashcards

Quantitative Analysis Flashcards

1
Q

what are the different cations to be tested?

A
  • ammonium
  • zinc
  • calcium
  • lead (II)
  • copper (II)
  • iron (II)
  • iron (III)
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2
Q

what happens when ammonium reacts with aqueous sodium hydroxide?

A

no precipitate, colourless and pungent gas is given off (ammonia)

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3
Q

what happens when ammonium reacts with aqueous ammonia

A

-

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4
Q

what happens when zinc reacts with aqueous sodium hydroxide?

A

white precipitate soluble in excess sodium hydroxide forming a colourless solution

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5
Q

what happens when zinc reacts with aqueous ammonia?

A

white precipitate soluble in excess aqueous ammonia forming a colourless solution

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6
Q

what happens when calcium reacts with aqueous sodium hydroxide?

A

white precipitate insoluble in excess sodium hydroxide

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7
Q

what happens when calcium reacts with aqueous ammonia?

A

no visible reaction

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8
Q

what happens when lead (II) reacts with aqueous sodium hydroxide?

A

white precipitate soluble in excess sodium hydroxide forming a colourless solution

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9
Q

what happens when lead (II) reacts with aqueous ammonia?

A

white precipitate insoluble in excess aqueous ammonia

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10
Q

what happens when copper (II) reacts with aqueous sodium hydroxide?

A

blue precipitate insoluble in excess sodium hydroxide

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11
Q

what happens when copper (II) reacts with aqueous ammonia?

A

blue precipitate soluble in excess aqueous ammonia forming a deep blue solution

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12
Q

what happens when iron (II) reacts with aqueous sodium hydroxide?

A

dirty green precipitate insoluble in excess sodium hydroxide

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13
Q

what happens when iron (II) reacts with aqueous sodium ammonia?

A

dirty green precipitate insoluble in excess aqueous ammonia

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14
Q

what happens when iron (III) reacts with aqueous sodium hydroxide?

A

reddish brown precipitate insoluble in excess sodium hydroxide

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15
Q

what happens when iron (III) reacts with aqueous ammonia?

A

reddish brown precipitate insoluble in excess aqueous ammonia

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16
Q

what are the different anions to be tested?

A
  • sulfate
  • chloride
  • nitrate
  • carbonate
17
Q

how to test for sulfate?

A

add dilute nitric acid followed by aqueous barium nitrate into test tube

18
Q

what is observed in sulfate test?

A

no visible reaction on adding dilute nitric acid. white precipitate formed on adding barium nitrate

19
Q

how to test for chloride?

A

add dilute nitric acid followed by aqueous silver nitrate into test tube

20
Q

what is observed in chloride test?

A

no visible reaction on adding dilute nitric acid. white precipitate formed on adding silver nitrate

21
Q

how to test for nitrate?

A

add aqueous sodium hydroxide and add aluminium foil into the test tube. warm gently and test gas with moist red litmus paper

22
Q

what is observed in nitrate test?

A

effervescence observed. colourless and pungent gas is given off which turns moist red litmus paper blue (ammonia)

23
Q

how to test for carbonate?

A

add dilute hydrochloric acid and bubble the gas evolved into aqueous calcium hydroxide (limewater)

24
Q

what is observed in carbonate test?

A

effervescence observed. colourless and odourless gas is given off which forms a white precipitate in calcium hydroxide (carbon dioxide)

25
Q

what are the different gases to be tested?

A
  • ammonia
  • carbon dioxide
  • chlorine
  • hydrogen
  • oxygen
  • sulfur dioxide
26
Q

how to test for ammonia?

A

place damp red litmus paper above the mouth of the test tube

27
Q

what is observed in ammonia test?

A

colourless and pungent gas produced which turns moist red litmus paper blue

28
Q

how to test for carbon dioxide?

A

bubble gas through aqueous calcium hydroxide (limewater)

29
Q

what is observed in carbon dioxide test?

A

white precipitate is formed

30
Q

how to test for chlorine?

A

place damp blue litmus paper at the mouth of the test tube

31
Q

what is observed in chlorine test?

A

damp blue litmus paper turns red and is then bleached

32
Q

how to test for hydrogen?

A

insert a lighted splint into the test tube

33
Q

what is observed in hydrogen test?

A

lighted splint extinguishes with a ‘pop’ sound

34
Q

how to test for oxygen?

A

insert a glowing splint into the test tube

35
Q

what is observed in oxygen test?

A

glowing splint will relight/burst into flames

36
Q

what is one way to test for sulfur dioxide?

A

place a filter paper strip soaked with acidified potassium manganate (VII) above the mouth of the test tube

37
Q

what is the observation of the first sulfur dioxide test?

A

the purple acidified potassium manganate (VII) decolourises

38
Q

what is a another test for sulfur dioxide?

A

place a filter paper soaked with acidified potassium dichromate (VI) above the mouth of the test tube

39
Q

what is observed in the second sulfur dioxide test?

A

the acidified potassium dichromate (VI) turns from orange to green

chemistry (19 decks)

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