Why is potassium dichromate green?
Correspondingly, why does acidified potassium dichromate turn green?
Acidified potassium dichromate(VI) is an oxidising agent that oxidises primary alcohols, secondary alcohols and aldehydes. During oxidation, dichromate(VI) ions are reduced and the colour changes from orange to green.
One may also ask, why is potassium dichromate oxidising agent? Potassium dichromate is powerful oxidizing agent in acidic medium. In presence of dilute sulphuric acid, it liberates nascent oxygen. In acidic medium, dichromate ion takes up electrons and acts as oxidizing agent.
Simply so, what gas turns potassium dichromate green?
What does potassium dichromate test for?
Acidified potassium dichromate solution is an orange solution which changes to green when the alcohol is oxidised. This can be used as a test for alcohols and only alcohols will show the orange to green colour change with acidified potassium dichromate solution.