Water Analysis Part 7 Flashcards

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1
Q

What do halides form insoluble compounds with?

A

The silver ion

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2
Q

What do carbonates react with?

A

Acids

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3
Q

What is limewater used to indicate the presence of?

A

Carbon dioxide

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4
Q

How can sulphate ions be identified by?

A

Adding barium chloride solution

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5
Q

How can nitrate ions be identified by?

A

Heating the solution with aluminium powder and sodium hydroxide

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6
Q

What will hydroxide ions react with and what do they do to litmus paper?

A

Ammonium chloride and turn red litmus paper blue

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7
Q

How can phosphate ions be identified by?

A

Mixing with ammonium molybdate solution

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8
Q

What is the result of a flame test for barium?

A

Pale green/yellow

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9
Q

What is the result of a flame test for calcium?

A

Brick red

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10
Q

What is the result of a flame test for copper?

A

Green/blue

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11
Q

What is the result of a flame test for lithium?

A

Red

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12
Q

What is the result of a flame test for sodium?

A

Orange/yellow

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13
Q

What is the result of a flame test for potassium?

A

Lilac

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14
Q

What is the colour of an iron(ii) precipitate?

A

Yellow

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15
Q

What is the colour of an iron (iii) precipitate?

A

Orange

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16
Q

What is the colour of a copper precipitate?

A

Blue

17
Q

What is the colour of a silver precipitate?

A

Brown

18
Q

What is the colour of a barium precipitate?

A

Cloudy white

19
Q

What is the colour of a lead precipitate?

A

Milky white

20
Q

What does iron (ii) form when mixed with sodium hydroxide?

A

Brown gelatinous precipitate

21
Q

What does silver form when mixed with hydrochloric acid?

A

White precipitate

22
Q

What does copper form when mixed with ammonia?

A

Blue gelatinous precipitate

23
Q

What does ammonium form when mixed with a hydroxide or a litmus test?

A

Ammonia gas smell, turns litmus blue

24
Q

What does iron (iii) form when mixed with KSCN or sodium hydroxide?

A

Blood red precipitate in KSCN, dark orange precipitate in sodium hydroxide