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Edexcel IGCSE Sciences Miscellaneous topics > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

1
Q

What is the test for Lithium ions?

A

Flame test:
- Press a clean wire loop of the compound into a watch glass containing hydrochloric acid
- Hold in the hottest region of a roaring bunsen flame
RESULT:
- Flame will turn red colour

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2
Q

What is the test for Sodium ions?

A

Flame test: flame will turn persistent orange colour

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3
Q

What is the test for Potassium ions?

A

Flame test; flame will turn lilac colour

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4
Q

What is the test for Calcium ions?

A

Flame test; flame will turn brick red colour

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5
Q

What is the test for ammonium ions?

A

Add NaOH solution and warm
Ammonia gas is produced; pungent smell, and turns red litmus paper blue

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6
Q

What is the test for Copper(II) ions?

A

Add NaOH solution
Pale blue precipitate(Cu(OH)2) forms

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7
Q

What is the test for Iron(II) ions?

A

Add NaOH solution
Dirty green precipitate (Fe(OH)2)forms

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8
Q

What is the test for Iron(III) ions?

A

Add NaOH solution
Rust brown precipitate(Fe(OH)3) forms

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9
Q

What is the test for Chlorine ions?

A

Add a small amount of Silver Nitrate and dilute nitric acid(to remove soluble carbonate ions and prevent a false positive)
- White precipitate of AgCl forms, which is soluble in dilute ammonia

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10
Q

What is the test for Bromine ions?

A

Add a small amount of silver nitrate followed by dilute nitric acid(to remove soluble carbonate ions and prevent a false positive)
- Cream precipitate of AgBr forms which is insoluble in dilute ammonia, but soluble in concentrated ammonia.

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11
Q

What is the test for Iodine ions?

A

Add a small amount of silver nitrate followed by dilute nitric acid(to remove soluble carbonate ions and prevent a false positive)
- Yellow precipitate of AgI forms which is insoluble in concentrated ammonia

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12
Q

What is the test for Sulfate ions?

A

Add a small amount of HCl and add BaCl solution
- White precipitate of BaSO4

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13
Q

What is the test for Carbonate ions?

A

Add dilute HCl and bubble any gas through limewater
- CO2 is produced, which turns imewater cloudy.

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14
Q

What is the test for ammonia?

A

Expose damp red litmus paper to gas; it will turn blue as ammonia is alkaline.

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15
Q

What is the test for Carbon dioxide?

A

Bubble the gas through limewater and a white precipitate (CaCO3) forms.

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16
Q

What is the test for Chlorine?

A

Expose damp blue litmus paper to the gas; it will turn red and then bleach white

17
Q

What is the test for Hydrogen?

A

Collect the gas in a test tube, and apply a lit splint
- Hydrogen gas ignites with a squeaky pop sound

18
Q

What is the test for Water?

A
  • It will turn anhydrous copper(II) sulfate from white to blue
  • It turns cobalt chloride paper blue to pink

Edexcel IGCSE Sciences Miscellaneous topics (6 decks)

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