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Chemistry 3 > Tests for Ions > Flashcards

Tests for Ions Flashcards

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1
Q

What colour does lithium give in a flame test?

A

Crimson.

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2
Q

What colour does sodium give in a flame test?

A

Yellow.

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3
Q

What colour does potassium give in a flame test?

A

Lilac.

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4
Q

What colour does calcium give in a flame test?

A

Red.

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5
Q

What colour does barium give in a flame test?

A

Green.

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6
Q

How else can you test for metal ions?

A

Add a few drops of sodium hydroxide solution to produce a coloured insoluble hydroxide.

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7
Q

Why do you add sodium hydroxide solution?

A

Some metal hydroxides are insoluble and precipitate out of solution when formed.

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8
Q

What colour precipitate does calcium give?

A

White.

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9
Q

What colour precipitate does copper II give?

A

Blue.

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10
Q

What colour precipitate does iron II give?

A

Green.

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11
Q

What colour precipitate does iron III give?

A

Brown.

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12
Q

What colour precipitate does aluminium give?

A

White, then colourless (in excess of NaOH).

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13
Q

What colour precipitate does magnesium give?

A

White.

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14
Q

How do you test for carbonates?

A

Add a dilute acid and see if it gives of CO2.

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15
Q

How do you test for halide ions?

A

Add dilute nitric acid (HNO3), then silver nitrate solution (AgNO3).

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16
Q

How does a chloride react to the halide ion test?

A

Gives a white precipitate of silver chloride.

17
Q

How does a bromide react to the halide ion test?

A

Gives a cream precipitate of silver bromide.

18
Q

How does a iodide react to the halide ion test?

A

Gives a yellow precipitate of silver iodide.

19
Q

How do you test for a sulfate ion?

A

Add dilute hydrochloric acid, followed by barium chloride solution.

20
Q

What is the result of the sulfate ion test?

A

A white precipitate of barium sulfate means the original compound was a sulfate.

Chemistry 3 (6 decks)

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