Tests For Ions And Gases COPY Flashcards Preview

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Flashcards in Tests For Ions And Gases COPY Deck (20)
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1
Q

Sodium flame

A

Orange

2
Q

Potassium flame

A

Lilac

3
Q

Calcium flame

A

Brick red

4
Q

Testing for ammonia NH4+

A

Warm with sodium hydroxide solution. Damp with red litmus. Result - litmus paper turns blue, pungent smelling gas

5
Q

What do you use for precipitation tests with copper, iron fe2+ and fe3+

A

Sodium hydroxide

6
Q

Colour of copper precipitate

A

Blue

7
Q

Colour of iron fe2+ precipitate

A

Green

8
Q

Colour of iron fe3+ precipitate

A

Brown

9
Q

What do you use for precipitation tests with chlorine, bromine and iodine

A

Dilute nitric acid and silver nitrate solution

10
Q

Colour of chlorine precipitate

A

White

11
Q

Colour of bromine precipitate

A

Cream

12
Q

Colour of iodine precipitate

A

Yellow

13
Q

Test for sulphate SO4 2-

A

Use dilute hydrochloride acid and barium chloride solution. Positive result : White precipitate

14
Q

Test for carbonate CO3 2-

A

Using dilute hydrochloric acid. Bubble it through limewater. Positive result : limewater turns cloudy

15
Q

Test for oxygen gas

A

Put a glowing splint into the gas. Splint should relight

16
Q

Test for carbon dioxide

A

A lighted wooden splint goes out in a test tube of carbon dioxide but this happens with other gases, too. It is better to bubble the test gas through lime water (calcium hydroxide solution) . Carbon dioxide turns limewater cloudy white

17
Q

Test for ammonia

A

Ammonia had a characteristic sharp, choking smell. It also makes damp red litmus paper turn blue. Ammonia forms a white smoke of ammonium chloride when hydrogen chloride gas, from concentrated hydrochloric acid, is held near it

18
Q

Test for chlorine

A

Chlorine has a characteristic shark, choking smell. It also makes damp blue litmus paper turn red, and then bleaches it white. Chlorine makes damp starch - iodide paper turn blue black

19
Q

Lithium flame

A

Red

20
Q

Test for hydrogen

A

Put a lit splint into the gas Hydrogen burns with a ‘squeaky pop’ sound