Chapter 19, Problem 49E

Interpretation Introduction

Interpretation:

The reason for the oxidation of Cl^-(aq) to Cl₂(g) by Cr₂O₇²- in acidic solution to not occur spontaneously should be explained. The experimental conditions used for this method to form chlorine gas in the laboratory needs to be determined.

Concept introduction:

In an electrochemical cell, there are two electrodes that can be observed.

If oxidation takes place on an electrode, that electrode is called anode. The species in that electrode remove electrons and itself gets oxidized.

If reduction takes place on an electrode, that electrode is called cathode. The species in that electrode absorbs electrons and itself gets reduced.

The electrode potential of cell can be calculated as follows:

$E^0{}_{\text{cell}}=E^0{}_{\text{cathode}} -E^0{}_{\text{anode}}$