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chemistry 😢🥹 > chemical analysis > Flashcards

chemical analysis Flashcards

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1
Q

how do we test for hydrogen

A

using the squeaky pop test

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2
Q

how do you conduct the squeaky pop test

A

1) collect a sample pop gas in a test tube
2) put a lit splint into the test tube
3) if hydrogen is present there should be a squeaky pop sound

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3
Q

how do we test for oxygen

A

glowing splint relights test

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4
Q

how do we conduct the glowing splint test

A

1) collect a sample of gas in a test tube
2)place a glowing splint into the test tube
3) if oxygen is present the glowing splint relights

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5
Q

how do we test for water

A

using the copper sulphate test
boiling point test

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6
Q

how do we conduct the copper sulphate test

A

1) add anhydrous copper sulphate to the sample
2) if it changes colour from white to blue then oxygen is present

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7
Q

how do we use the boiling point test to see if water is present

A

1) measure its boiling point
2) the closer to 100c the pure the water is

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8
Q

what are cations

A

positive ions

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9
Q

what test do we use to determine what cation is present

A

flame tests that cause a non lumious bunsen flame to change colour

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10
Q

how to conduct a flame test

A

dip a piece of nichrome wire into HCL
dip the wire into a sample of solid or solution]
place the tip of the wire into a non luminous Bunsen flame

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11
Q

why do we dip nichrome wore into HCL before conducting a flame test

A

so that the wire is clean

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12
Q

what colour does li+ turn a non luminous Bunsen flame

A

red

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13
Q

what colour does NA+ turn a non luminous Bunsen flame

A

yellow

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14
Q

what colour does k+ turn a non luminous Bunsen flame

A

lilac

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15
Q

what colour does ca 2+ turn a non luminous Bunsen flame

A

orange/ red

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16
Q

what colour does cu2+ turn a non luminous Bunsen flame

A

blue / green

17
Q

what test di we use to test for cu2+ fe2+ and fe3+

A

sodium hydroxide test

18
Q

how do we conduct the sodium hydroxide test

A

1) dissolve the sample in water
2) add a few drops of NAOH

19
Q

what colour does the metal cation cu2+ go in the sodium hydroxide test

A

blue

20
Q

what colour does the metal cation Fe2+ go in the sodium hydroxide test

A

green

21
Q

what colour does the metal cation fe3+ go in the sodium hydroxide test

A

brown

22
Q

what is the precipitate formula for cu2+ in the NAOH test

A

cu(OH)2

23
Q

what is the precipitate formula for Fe2+ in the NaOH test

A

Fe(OH)2

24
Q

what is the precipitate formula for fe3+ in the NAOH test

A

fe(OH)3

25
Q

how do we test for ammonium

A

using sodium hydroxide

26
Q

how do we conduct an ammonium test

A
  • dissolve the sample in water
  • add some NaOH and warm it
  • test the gas released with damp red litmus paper
  • if ammonium ions are present the litmus paper will turn blue
27
Q

what are anions

A

negative ions

28
Q

how do we test for halides

A

using the silver nitrate test

29
Q

how do we conduct the silver nitrate test

A
  • dissolve the sample i water
  • add nitric acid (HNO3)
  • add silver nitrate solution (AGNO3)
30
Q

what colour is the precipitate of the halide ion cl- in the silver nitrate test

A

white

31
Q

what colour is the precipitate of the halide ion br- in the silver nitrate test

A

cream

32
Q

what colour is the precipitate of the halide ion i- in the silver nitrate test

A

yellow

33
Q

what is the precipitate formula of the halide ion cl- in the silver nitrate test

A

AgCl

34
Q

what is the precipitate formula of the halide ion br- in the silver nitrate test

A

AGBR

35
Q

what is the precipitate formula of the halide ion I- in the silver nitrate test

A

AgI

36
Q

how do we test for carbonates

A
  • add hydrochloric acid and look for effervescence
  • if there is effervescence bubble the gas that is produced through lime water
  • if carbonates are present in the example the gas produced will turn the limewater cloudy
37
Q

how do we test for sulphates

A
  • add HCL and look for effervescence
  • if there is no effervescence add barium chloride (BACL2) solution
  • if sulphate ions are present a white precipitate will form

chemistry 😢🥹 (19 decks)

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