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Chemistry > Test for ions > Flashcards

Test for ions Flashcards

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1
Q

How do you test for hydrogen?

A

Put a lit splint into a test tube and you will hear a squeaky pop if hydrogen is present

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1
Q

How do you test for oxygen?

A

Put a glowing splint into a test tube the match well relight if oxygen is present

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2
Q

How do you test for carbon dioxide?

A

Bubble the gas (co2) into lime water and it will change form colourless to milky if co2 is present

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3
Q

How do you test for ammonia?

A

Put damp red litmus paper into the mouth of a test tube the litmus paper will turn blue if ammonia is present

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4
Q

How do you test for chlorine?

A

Damp blue litmus paper into the mouth of a test tube it will turn white if chlorine is present

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5
Q

What are cations?

A

Positive ions

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6
Q

What are anions?

A

Negative ions

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7
Q

What are the 3 test for cations? (3)

A
  1. Flame tests
  2. Ammonium test
  3. Copper (ll), iron (ll), iron (lll)
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8
Q

What are the 3 test for anions?

A
  1. Chloride, bromide, idide
  2. Sulphate
  3. Carbonate
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9
Q

What is the test for water?

A

Use anhydrous, it will turn from white to blue if water is present

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10
Q

What are the 5 ions used in the flame tests and there chemical symbol? (5)

A
  1. Lithium Li^+
  2. Sodium Na^+
  3. Potassium K^+
  4. Calcium Ca^2+
  5. Copper Cu^2+
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11
Q

How do you carry out a flame test? (3)

A
  1. Dip wire loop into HCl
  2. Then into a solid compound
  3. Place it under the bunsen flame
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12
Q

What is important to keep in mind when carrying out a flame test?

A

To clean the wire loop each time by dipping it into the HCl

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13
Q

What is the positive result for lithium in a flame test?

A

Crimson

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14
Q

What is the positive result for sodium in a flame test?

A

Yellow

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15
Q

What is the positive result for potassium in a flame test?

A

Lilac

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16
Q

What is the positive result for calcium in a flame test?

A

Brick red

17
Q

What is the positive result for copper in a flame test?

A

Green

18
Q

How do you carry out the ammonium test? (2)

A
  1. Add sodium hydroxide and warm
  2. Test the gas produced with damp litmus paper
19
Q

How do you carry out the test testing for copper (ll), iron (ll), iron (lll)?

A
  1. Add sodium hydroxide
20
Q

What is the positive result for the ammonium test?

A

Blue/purple

21
Q

What is important to keep in mind during the ammonium test?

A

The gas tested on the litmus paper in ammonia (NH3)

22
Q

What is the positive result for copper (ll) and the chemical symbol?

A

Blue precipitate Cu(OH)2

23
Q

What is the positive result for iron (ll) and the chemical symbol?

A

Green precipitate Fe(OH)2

24
Q

What is the positive result for iron (lll) and the chemical symbol?

A

Orange precipitate Fe(OH)3

25
Q

How do you carry out the test for chloride, bromide and iodide? (2)

A
  1. Add silver nitrate
  2. Then acidify with dilute nitric acid
26
Q

What is the positive result for chloride?

A

White precipitate

27
Q

What is the positive result for bromide?

A

Cream precipitate

28
Q

What is the positive result for iodide?

A

Yellow precipitate

29
Q

How do you carry out the test for sulphate? (2)

A
  1. Add barium chloride
  2. Then acidify with dilute HCl
30
Q

What is the positive result for sulphate?

A

White percipitate

31
Q

How do you carry out the test for carbonate?

A
  1. Add some acid
32
Q

What is the positive result for carbonate?

A

Cloudly/milky

33
Q

What is the chemical symbol for ammonium?

A

NH4^+

34
Q

What is the chemical symbol for copper (ll)?

A

Cu^2+

35
Q

What is the chemical symbol for iron (ll)?

A

Fe^2+

36
Q

What is the chemical symbol for iron (lll)?

A

Fe^3+

37
Q

What is the chemical symbol for chloride?

A

Cl^-

38
Q

What is the chemical symbol for bromide?

A

Br^-

39
Q

What is the chemical symbol for Iodide?

A

I^-

40
Q

What is the chemical symbol for sulphate?

A

SO4^2-

41
Q

What is the chemical symbol for carbonate?

A

CO3^2-

Chemistry (12 decks)

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