Ethanol can be oxidised by heating with potassium dichromate(VI) in dilute sulfuric acid
4 marks · NormalWhat is the appearance of the potassium dichromate(VI) solution before ethanol is added?
Describe the appearance of the solution after heating with ethanol.
What does the observed colour change indicate about the reaction?
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(a) Orange solution
(b) Green solution after heating with ethanol
(c) Oxidation of ethanol has occurred
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Marking points
B1 (a) · 1 mark · States orange colour (appearance) before ethanol is added.
M1 (b) · 1 mark · Mentions change in appearance after reaction.
A1 (b) · 1 mark · Describes new colour is green.
A2 (c) · 1 mark · States green colour shows oxidation of ethanol has occurred.
Worked solution
(a) Orange solution.
(b) Solution turns green after heating with ethanol.
(c) The colour change to green indicates ethanol has been oxidised.