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Chemistry Module 3 > Qualitative Analysis > Flashcards

Qualitative Analysis Flashcards

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1
Q

How can you test for carbonate ions?

A

Add strong acid to sample

Collect gas produced and bubble through lime water

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2
Q

How can you test for sulphate ions?

A

Add dilute hydrochloric acid and barium chloride to the sample

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3
Q

What will happen if carbonate ions are present?

A

Effervescence
Lime water turns cloudy

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4
Q

What happens if sulphate ions are present?

A

A white precipitate of barium sulphate is produced

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5
Q

What is used to test for halogens?

A

Acidified silver nitrates (AgNO3)

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6
Q

How can you test for halide ions?

A

Add aqueous silver nitrate

If colour change is difficult to distinguish add aqueous ammonia, first dilute ammonia then concentrated ammonia

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7
Q

Why do you add nitric acid to test for halides and not HCl?

A

To remove carbonate ions

Adding HCl would add Cl ions giving a false, positive result

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Chemistry Module 3 (8 decks)

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