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chemistry > testing for ions > Flashcards

testing for ions Flashcards

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1
Q

how do you carry out a flame test?

A
  1. dip a clean nichrome wire loop into a solid sample of the compound
  2. put the loop into the edge of the blue flame from a bunsen burner
  3. observe and record the flame colour produced
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2
Q

what ion is a flame test used on?

A

a cation

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3
Q

what is the flame colour for lithium?

A

red

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4
Q

what is the flame colour for sodium?

A

yellow

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5
Q

what is the flame colour for potassium?

A

lilac

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6
Q

what is the flame colour for calcium?

A

orange-red

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7
Q

what is the flame colour for copper?

A

blue-green

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8
Q

what are the 3 anion tests?

A

halide, sulfate and carbonate

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9
Q

how do you carry out a halide test?

A

add nitric acid, then add silver nitrate

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10
Q

what is the precipitate colour for chloride?

A

white

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11
Q

what is the precipitate colour for bromide?

A

cream

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12
Q

what is the precipitate colour for iodide?

A

yellow

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13
Q

how do you carry out a sulfate test?

A

add HCl, then add barium chloride

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14
Q

what is the result of a positive sulfate test?

A

a white precipitate will form of barium sulfate

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15
Q

how do you carry out a carbonate test?

A

add HCl or another acid

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16
Q

what is the result of a positive carbonate test?

A

CO2 bubbles will form

limewater will turn colourless if CO2 is present

17
Q

how do you carry out a hydroxide/OH-/precipitate test?

A

you add a few drops of OH-

18
Q

what is the precipitate colour for iron2+?

A

green

19
Q

what is the precipitate colour for iron3+?

A

brown

20
Q

what is the precipitate colour for copper?

A

blue

21
Q

what is the precipitate colour for aluminium?

A

white

22
Q

what is the precipitate colour for calcium?

A

white

23
Q

how do you carry out an ammonium test?

A

add a few drops of OH-

24
Q

what is the positive result of an ammonium test?

A

damp red litmus paper turns blue

chemistry (3 decks)

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