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Chemistry > Positive And Negative Ion Tests > Flashcards

Positive And Negative Ion Tests Flashcards

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1
Q

What colour flame does Lithium produce in a flame test?

A

Crimson flame.

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2
Q

What colour flame does Sodium produce in a flame test?

A

Yellow flame.

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3
Q

What colour flame does Potassium produce in a flame test?

A

Lilac flame.

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4
Q

What colour flame does Calcium produce in a flame test?

A

Red flame.

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5
Q

What colour flame does Barium produce in a flame test?

A

Green flame.

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6
Q

How do you carry out a flame test?

A

First dip a wire loop in hydrochloric acid and rinse it with distilled water so it is clean.
Then dip the wire loop into a sample of the compound and put the wire into the Bunsen burner to produce a flame.

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7
Q

What substances produce a coloured precipitate with sodium hydroxide?

A 
Metal ions:
Calcium 2+
Copper(II) 2+
Iron(II) 2+
Iron(III) 3+
Aluminium 3+
Magnesium 2+
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8
Q

What does Calcium form when mixed with sodium hydroxide?

A

White precipitate.

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9
Q

What does Copper(II) form when mixed with sodium hydroxide?

A

Blue precipitate.

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10
Q

What does Iron(II) form when mixed with sodium hydroxide?

A

Green precipitate.

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11
Q

What does Iron(III) form when mixed with sodium hydroxide?

A

Brown precipitate.

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12
Q

What does Aluminium form when mixed with sodium hydroxide?

A

White precipitate at first but redissolves into a colourless solution when excess sodium hydroxide is added.

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13
Q

What Magnesium does form when mixed with sodium hydroxide?

A

White precipitate.

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14
Q

How do you test for carbonates?

A

Bubble the gas through limewater if the limewater turns cloudy then cabin dioxide is present.
This proves carbonate ions are present as carbonates react with dilute acids to form CO2.

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15
Q

What are the halide ions?

A

Chloride
Bromide
Iodine

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16
Q

What is the test for the halide ions?

A

Add dilute nitric acid to the substance.
Then add silver nitrate solution.
A coloured precipitate will form which will identify the halide.

17
Q

What colour precipitate does chloride form?

A

A white precipitate of silver chloride.

18
Q

What colour precipitate does bromide form?

A

A creamy precipitate of silver bromide.

19
Q

What colour precipitate does iodine form?

A

A yellow precipitate of silver iodine.

20
Q

What is the test for sulfate ions?

A

Add dilute hydrochloric acid to the substance.
Then add barium chloride solution.
If a white precipitate of barium sulphate is formed then the original compound was a sulfate.

21
Q

What substances can you test for using flame tests?

A 
Metals ions:
Lithium 1+
Sodium 1+
Potassium 1+
Calcium 2+
Barium 2+

Chemistry (6 decks)

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