A yellow crystalline solid E dissolved in distilled water to give a yellow solution.
Addition of dilute sulfuric acid to this solution produced an orange solution F.
Warming F with ethanol resulted in a green solution G, and the formation of ethanol.
A standard cell was set up using solutions of F and G for the right-hand electrode and ethanol and ethanal for the left-hand electrode.
Eθcell was found to be +1.94 V.
CH3CHO (aq) + 2H+ (aq) + 2e– C2H5OH (aq) Eθ = –0.61 V
Deduce the formulae of the ions responsible for the colours of F and G, using the standard electrode potential and Eθ given, and the values in the Data Booklet.
Write the overall equation for the reaction in the cell.
State symbols are not required.
Write the ionic equation for the reaction of the aqueous solution of E with dilute sulfuric acid. State symbols are not required.
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