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chemistry > 4.6 - Chemical Analysis > Flashcards

4.6 - Chemical Analysis Flashcards

1
Q

Chemical test for water

A

anhydrous copper sulfate

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2
Q

Chemical test for water: COLOUR CHANGE

A

white to blue

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3
Q

Purity of water

A

boiling point - 100C

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4
Q

Test for chlorine

A

damp blue litmus paper

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5
Q

Test for chlorine: COLOUR CHANGE

A

blue to white (bleached)

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6
Q

Test for ammonia

A

damp red litmus paper

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7
Q

Test for ammonia: COLOUR CHANGE

A

red to blue

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8
Q

What cations do you test for in the flame test?

A

-lithium
-sodium
-potassium
-calcium
-copper

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9
Q

Flame test: what type of wire do you use?

A

nichrome/ platinum wire

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10
Q

Flame test: what acid do you initially dip the nichrome wire in to?

A

hydrochloric acid

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11
Q

Flame test: what type of flame do you put the tip of the wire in?

A

non-luminous Bunsen flame

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12
Q

Flame test colour: lithium

A

red

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13
Q

Flame test colour: sodium

A

yellow

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14
Q

Flame test colour: potassium

A

purple

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15
Q

Flame test colour: calcium

A

orange-red

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16
Q

Flame test colour: copper

A

blue-green

17
Q

What cations do you test for in the sodium hydroxide test?

A

-copper
-iron II
-iron III

18
Q

Sodium hydroxide test: How do you conduct it?

A

-dissolve sample in water
-add few drops of NaOH

19
Q

Sodium hydroxide test: copper

A

blue precipitate

20
Q

Sodium hydroxide test: iron II

A

green precipitate

21
Q

Sodium hydroxide test: iron III

A

brown precipitate

22
Q

Ammonium test: How do you conduct it?

A

-dissolve sample in water
-add some NaOH and warm it
-test gas evolved with red litmus paper

23
Q

Silver nitrate test: what anions does it test for?

A

halide ions
-bromine
-chlorine
-iodine

24
Q

Silver nitrate test: How do you conduct it?

A

-dissolve sample in water
-add nitric acid (HNO3)
-add silver nitrate (AgNO3)

25
Q

Silver nitrate test: chlorine

A

white precipitate

26
Q

Silver nitrate test: bromine

A

cream precipitate

27
Q

Silver nitrate test: iodine

A

yellow precipitate

28
Q

Test for carbonates: How do you conduct it?

A

-add HCl and look for effervescence
-if there is effervescence then bubble through limewater

29
Q

Test for carbonates: colour change

A

limewater turns cloudy

30
Q

Test for sulfates: How do you conduct it?

A

-add HCl and look for effervescence
-if there is no effervescence then add barium chloride solution

31
Q

Test for sulfates: observations

A

white precipitate forms (if positive)

chemistry (15 decks)

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