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gcse chemistry > Analytical Chemistry > Flashcards

Analytical Chemistry Flashcards

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1
Q

Describe the test for carbonates

A

Add any acid to the solution/substance
Bubble the gas produced through limewater
If it goes cloudy it is a carbonate

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2
Q

Describe the text for sulphates

A

Add hydrochloride or nitric acid to the substance
Add barium chloride
If there is a white precipitate it is a sulphate

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3
Q

Describe the test for halides

A 
Add sulphuric or nitric acid to the substance 
Add silver nitrate
If precipitate: 
Chloride: white
Bromide: cream
Iodide: yellow
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4
Q

Describe the test for ammonium

A

Add sodium hydroxide to the substance (to form ammonia)
Heat gently to release the ammonia from solution
Hold damp red litmus over the mouth of the test tube
If it turns blue it is ammonium

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5
Q

What colour precipitate will be created when sodium hydroxide is added to Fe2+

A

Green

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6
Q

What colour precipitate will be created when sodium hydroxide is added to Fe 3+

A

Reddish-brown

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7
Q

What colour precipitate will be created when sodium hydroxide is added to Cu 2+

A

Blue

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8
Q

What colour will the flame go if you add lithium?

A

Red

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9
Q

What colour will the flame go if you add sodium?

A

Yellow

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10
Q

What colour will the flame go if you add potassium?

A

Lilac

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11
Q

What colour will the flame go if you add calcium?

A

Orange-red

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12
Q

What colour will the flame go if you add copper?

A

Blue-green

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13
Q

Describe how to do a flame test

A

1) clean a platinum flake test loop in HCl to remove traces of other chemicals
2) dip the loop in the solution/substance you are testing
3) hold in a roaring flame and observe colour change

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14
Q

What is the test for oxygen?

A

A glowing splint relights

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15
Q

What is the test for hydrogen ?

A

When lit it gives a squeaky pop

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16
Q

What is the test for carbon dioxide ?

A

When bubbles through like water it does cloudy

17
Q

What is the test for chlorine?

A

Damp blue litmus goes red then bleached white

18
Q

What is the test for ammonia?

A

Turns damp red litmus blue, string smell

19
Q

What is the test for liquid water?

A

Cobalt chloride paper goes from blue to pink
Or
Anhydrous copper sulphate goes from white to blue

20
Q

What is the test to ensure liquid water is pure?

A

Check the boiling and freezing points

gcse chemistry (13 decks)

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