A student was given four colourless liquids that were labelled A, B, C and D - VCE - SSCE Chemistry - Question 1 - 2006 - Paper 1
Question 1
A student was given four colourless liquids that were labelled A, B, C and D. They were known to be ethanol, ethanoic acid, pentane and hexene, but the exact identit... show full transcript
Worked Solution & Example Answer:A student was given four colourless liquids that were labelled A, B, C and D - VCE - SSCE Chemistry - Question 1 - 2006 - Paper 1
Step 1
Identify liquid A
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Answer
Liquid A is hexene. This is indicated by its insolubility in water, the disappearance of red-coloured bromine (which suggests that it is an alkene), and the evolution of gas when sodium carbonate is added (indicating an acid-catalyzed reaction).
Step 2
Identify liquid B
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Answer
Liquid B is ethanoic acid. It is soluble in water and shows no immediate reaction with bromine, typical for a carboxylic acid, and it does not respond to sodium carbonate.
Step 3
Identify liquid C
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Answer
Liquid C is ethanol. It is soluble in water, does not decolorize bromine, and also shows no reaction with sodium carbonate.
Step 4
Identify liquid D
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Answer
Liquid D is pentane. It is insoluble in water and shows no reactions with bromine or sodium carbonate.
