2019 A Level H2 Chemistry Paper 1 Question 29 - Measure Standard Electrode Potential

Let Chemistry Guru, Singapore's renowned JC Chemistry tuition centre, guide you through 2019 A Level H2 Chemistry Paper 1 Question 29.

We are asked to determine the set of concentrations that would give the correct value of standard electrode potential for an electrode system.

First we will have to determine which species are taking part in reduction/oxidation in this reversible electrode.

Notice the oxidation state of Cl is +1 in HOCl and zero in Cl₂.

This means the species that we should focus on is HOCl and Cl₂ since there is a change on oxidation state for Cl.

In the forward direction HOCl(+1) is reduced to Cl₂(0), while in the reverse direction Cl₂(0) is oxidised to HOCl(+1).

The standard conditions required for standard electrode potential should apply to both HOCl and Cl₂.

Standard conditions: Temperature at 298K, Pressure at 1 atm, Concentration of solutions at 1.0 moldm^-3

Hence concentration of HOCl and Cl₂ has to be both at 1.0 moldm^-3.

Notice the concentration of H⁺ is not that important since it just provides the acidic medium for the system.

By comparing the options we can conclude the correct answer to this question should be option B.

Topic: Electrochemistry, Physical Chemistry, A Level Chemistry, Singapore

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