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Chemistry > Analysis > Flashcards

Analysis Flashcards

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1
Q

What metal ions are present when the flame turns crimson red?

A

Lithium

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2
Q

What metal ions are present when the flame turns yellow?

A

Sodium

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3
Q

What metal ions are present when the flame turns lilac?

A

Potassium

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4
Q

What metal ions are present when the flame turns brick red?

A

Calcium

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5
Q

What is the test for hydrogen?

A

Gives a squeaky pop with a lighted spill

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6
Q

What is the test for oxygen?

A

Relights a glowing splint

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7
Q

What is the test for carbon dioxide?

A

Turns limewater cloudy

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8
Q

What is the test for chlorine?

A

Bleaches damp litmus paper

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9
Q

What is the test for ammonia?

A

Turns damp red litmus paper blue

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10
Q

What is the test when using sodium hydroxide?

A

Add a few drops of sodium hydroxide to the solution being tested

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11
Q

What is the colour of the precipitate when copper ions are present?

A

Blue

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12
Q

What is the colour of the precipitate when iron (II) ions are present?

A

Green

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13
Q

What is the colour of the precipitate when iron (III) ions are present?

A

Rust

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14
Q

What is the test for identifying sulphate ions?

A

Add a few drops of hydrochloric acid followed by barium chloride solution

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15
Q

How do you test for ammonium ions?

A

Add aqueous sodium hydroxide to the sample and gently warm the mixture. A pungent-smelling gas is produced if ammonium ions are present. The gas produced turns damp red litmus paper blue. This gas is ammonium, NH3.

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16
Q

When the colour of the precipitate is white, what halide ion is present?

A

Silver chloride

17
Q

When the colour of the precipitate is cream, what halide ion is present?

A

Silver bromide

18
Q

When the colour of the precipitate is yellow, what halide ion is present?

A

Silver iodide

19
Q

How do you carry out the flame test for positive ions?

A

1) Put a small amount of the compound to be tested in a nichrome wire loop. (First the wire loop should be dipped in concentrated hydrochloric acid and heated to clean it. Then it should be dipped in the acid again before dipping in the compound).
2) Hold the loop in the roaring blue flame of a Bunsen burner.
3) Use the colour of the Bunsen flame to identify the metal ion in the compound

20
Q

What is the test for ammonia gas?

A

Ammonia will form a white smoke in the presence of hydrogen chloride gas, HCl. The white smoke is ammonium chloride, NH4Cl.

Chemistry (8 decks)

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