Unknown Compound X

  • Created by: alijen
  • Created on: 21-06-18 17:25
What is the method and result of the Carbonate Test?
Method: 1. Add acid to unknown 2. Collect gas. Results: gas is CO
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What is the method of the Flame Test (for cations)?
Method: 1. Take a Pt wire + dip into HCl 2. Heat wire in blue flame 3. Dip in acid 4. Dip in unknown 5. Place in blue flame
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What colour does Li go?
Crimson
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What colour does Na go?
Yellow
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What colour does K go?
Lilac
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What colour does Ca go?
Red
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What colour does Ba go?
Green
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What is the method for the Halides test?
Method: 1. Add small amount HNO 2. Add AgNO
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What are the results for the Halides test and what is an issue?
Cl : white ppt, Br : cream ppt and I : yellow ppt. It is hard to differentiate cream and yellow and so can be hard to tell what substance it is
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What is the method and result for the Sulfate test?
Method: 1. Add barium chloride solution to unknown 2. Add small amount HCl. Result: white ppt forms (BaSO )
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What is the method for Cations (not flame)?
Method: 1. Add a small amount of sodium hydroxide solution. 2. Record observations. 3. Add an excess of sodium hydroxide 4. Record results
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What is the appearance, observation few drops, observation excess and name of Al ?
clear colourless, white ppt, ppt dissolves and Aluminium hydroxide
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What is the appearance, observation few drops, observation excess and name of Ca ?
clear colourless, white ppt, ppt remains and Calcium Hydroxide
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What is the appearance, observation few drops, observation excess and name of Mg ?
clear colourless, white ppt, ppt remains and Magnesium Hydroxide
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What is the appearance, observation few drops, observation excess and name of Cu ?
clear blue, blue ppt, ppt remains and Cooper II Hydroxide
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What is the appearance, observation few drops, observation excess and name of Fe ?
clear pale green, green gelatinous ppt, ppt remains and Iron (II) Hydroxide
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What is the appearance, observation few drops, observation excess and name of Fe ?
clear orange, brown gelatinous ppt, ppt remains and Iron (III) Hydroxide
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What is the equation of forming a ppt of Aluminium Hydroxide?
Al + 3OH --> Al(OH)
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Other cards in this set

Card 2

Front

What is the method of the Flame Test (for cations)?

Back

Method: 1. Take a Pt wire + dip into HCl 2. Heat wire in blue flame 3. Dip in acid 4. Dip in unknown 5. Place in blue flame

Card 3

Front

What colour does Li go?

Back

Preview of the front of card 3

Card 4

Front

What colour does Na go?

Back

Preview of the front of card 4

Card 5

Front

What colour does K go?

Back

Preview of the front of card 5
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