Chemistry - Analysis

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  • Created by: becky.65
  • Created on: 21-02-16 12:12
In a flame test for positive ions, what colour does lithium produce?
Crimson
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In a flame test for positive ions, what colour does sodium produce?
Yellow
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In a flame test for positive ions, what colour does potassium produce?
Lilac
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In a flame test for positive ions, what colour does calcium produce?
Brick red
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In a flame test for positive ions, what colour does barium produce?
Apple green
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What happens when sodium hydroxide is added to solutions of metal ions with 2+ and 3+ charge?
A precipitate of the metal hydroxide forms
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What three metals form a white precipitate of their hydroxide?
Aluminium, calcium and magnesium
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What colour is copper(ii) hydroxide precipitate?
Blue
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What colour is iron(ii) hydroxide precipitate?
Green
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What colour is iron(iii) hydroxide precipitate?
Brown
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How can we distinguish between the three metal hydroxides that produce a white precipitate?
Aluminium hydroxide dissolves in excess sodium hydroxide solution, magnesium hydroxide produces no colour in a flame test, calcium hydroxide produces a brick red colour in a flame test
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How can we test for carbonate ions?
Add dilute hydrochloric acid to the substance to see if it fizzes. If it doe and the gas produced turns limewater cloudy, the substance contains carbonate ions
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How can we test for halide ions?
Add dilute nitric acid and then silver nitrate solution
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What colour precipitate do chloride ions produce?
White
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What colour precipitate do bromide ions produce?
Cream
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What colour precipitate do iodide ions produce?
Yellow
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How can we test for sulfate ions?
Add dilute hydrochloric acid and then barium chloride solution. If a white precipitate forms, sulfate ions are present.
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What can paper chromatography be used for?
To analyse the artificial colours in food or the dyes in in
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The colours move different distances depending on what?
Their solubility
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How do you calculate the retention factor?
the distance a spot travels up the paper / the distance the solvent front travels
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Other cards in this set

Card 2

Front

In a flame test for positive ions, what colour does sodium produce?

Back

Yellow

Card 3

Front

In a flame test for positive ions, what colour does potassium produce?

Back

Preview of the front of card 3

Card 4

Front

In a flame test for positive ions, what colour does calcium produce?

Back

Preview of the front of card 4

Card 5

Front

In a flame test for positive ions, what colour does barium produce?

Back

Preview of the front of card 5
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