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Chemistry Unit 2 + 3 > Unit 3 - Analysis (Testing For Positive And Negative Ions) > Flashcards

Unit 3 - Analysis (Testing For Positive And Negative Ions) Flashcards

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1
Q

What colour does lithium go in a flame?

A

Crimson

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2
Q

What colour does sodium go in a flame?

A

Yellow

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3
Q

What colour does potassium go in a flame?

A

Lilac

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4
Q

What colour does calcium go in a flame?

A

Red

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5
Q

What colour does barium go in a flame?

A

Green

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6
Q

When doing a flame test, how do you make sure the wire loop is completely clean?

A

By dipping in into hydrochloric acid and rinsing it with distilled water

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7
Q

What is the other test for metal ions?

A

Sodium hydroxide test - Add a few drops of sodium hydroxide solution to a solution of the unknown substance

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8
Q

What colour does the precipitate go for Calcium

A

White

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9
Q

What colour does the precipitate go for copper

A

Blue

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10
Q

What colour does the precipitate go for iron (II)?

A

Green

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11
Q

What colour does the precipitate go for iron (III)?

A

Brown

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12
Q

What colour does the precipitate go for aluminium?

A

White - at first

It then redissolves in excess NaOH to form a colourless solution

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13
Q

What colour does the precipitate go for magnesium?

A

White

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14
Q

Is the metal iron the positive or negative ion?

A

Positive

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15
Q

How can you test for metal ions?

A

Putting the substance in a flame

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16
Q

How do you test for carbonates?

A

Test for carbon dioxide - you can test to see if a gas is carbon dioxide by bubbling it through limewater
If it’s lime water: the limewater goes cloudy
You can use this test for carbonate ions since carbonates react with dilute acid to form carbon dioxide

17
Q

How do you test for Halide ions? (Chloride, bromide and iodide)

A

Add dilute nitric acid followed by silver nitrate solution

18
Q

Testing for negative ions: What precipitate does chloride give?

A

White Percipitate of Silver chloride

19
Q

Testing for negative ions: what precipitate does bromide give

A

A cream ppte of silver bromide

20
Q

Testing for negative ions: what ppte does iodide give

A

A yellow ppte of silver iodide

21
Q

How do you test for sulfate ions? (

A

Add dilute HCL followed by barium chloride solution

22
Q

Testing for negative ions: sulfate ions: what does a white ppte of barium sulfate mean?

A

The original compound was sulfate

23
Q

Testing for negative ions: what result does carbonate give?

A

Effervescence

24
Q

Testing for negative ions: what result does sulfate give?

A

White ppte

25
Q

Testing for negative ions: what result does nitrate give?

A

Moist red litmus paper placed in the mouth of the tube turns blue

Chemistry Unit 2 + 3 (17 decks)

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