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chemistry > t8-chemical analysis > Flashcards

t8-chemical analysis Flashcards

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1
Q

test for oxygen

A

a glowing splint will relight

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2
Q

test for hydrogen

A

a lit splint will ignite with a squeaky pop sound

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3
Q

test for carbon dioxide

A

limewater will turn cloudy white

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4
Q

test for chlorine

A

damp litmus paper will bleach white

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5
Q

how to do a flame test

A
  1. dip a wire loop into a sample of the compound
  2. hold it on a blue flame of a bunsen burner
  3. observe the flame colour
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6
Q

flame colour for lithium

A

crimson

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7
Q

flame colour for sodium

A

yellow

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8
Q

flame colour for potassium

A

lilac

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9
Q

flame colour for calcium

A

orange-red

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10
Q

flame colour for copper

A

green

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11
Q

precipitate colour for aluminium

A

white

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12
Q

precipitate colour for calcium

A

white

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13
Q

precipitate colour for magnesium

A

white

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14
Q

precipitate colour for copper

A

blue

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15
Q

precipitate colour for iron (ll)

A

green

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16
Q

precipitate colour for iron (lll)

A

brown

17
Q

how is bubbling caused in tests for carbonate ions

A

bubbling in dilute acid is caused by co2
use limewater to confirm it’s CO2 -it’ll turn cloudy white

18
Q

test for sulfate ions

A

they react with barium ions to form insoluble white barium sulfate

19
Q

how to test for sulfate ions

A
  1. add few drops of dilute HCl to sample
  2. add few drops of dilute barium chloride
  3. white precipitate forms if sulfate ions are present
20
Q

precipitate colour for chloride (halide ion test)

A

white

21
Q

precipitate colour for bromide (halide ion test)

A

cream

22
Q

precipitate colour for iodide (halide ion test)

A

yellow

23
Q

what does flame emission spectroscopy do

A

identify metal ions
determines concentration of metal ions in dilute solutions

24
Q

what are metal hydroxide tests

A

-dilute sodium hydroxide used to test for metal ions
-metal ions form insoluble hydroxides-precipitates

25
Q

reaction for testing for copper ions

A

copper sulfate+dilute sodium hydroxide->sodium sulfate+copper hydroxide
-blue precipitate

26
Q

what happens if excess sodium hydroxide solution is added to aluminium hydroxide

A

dissolves to form a colourless solution

27
Q

what happens if excess sodium hydroxide solution is added to calcium hydroxide

A

precipitate is unchanged- stays white

28
Q

what happens if excess sodium hydroxide solution is added to magnesium hydroxide

A

precipitate is unchanged- stays white

29
Q

how to test for carbonate ions

A
  • use any acid to add to sample
30
Q

how to test for halide ions

A

-add nitric acid
-add silver nitrate

chemistry (11 decks)

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