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CHEM352/354 – 2022-2023 – CS WORKSHOP 01
QUESTION 1: Ionic strengths and activities
(i) What concentration of CuSO4 has the same ionic strength of a 2.5M
solution of KCl
(ii) What concentration of CuSO4 has the same mean ionic activity coefficient
of a 0.013 M solution of KCl
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QUESTION 2: A blast from the past
The Edison Storage battery consists of a Fe/FeO electrode and a nickel oxide
electrode. A KOH alkaline electrolyte is used, and its standard notation is
Fe, FeO (s)| KOH (aq.) | Ni2O3, NiO (s)
The cell reaction is + → +
The standard potential of the cell is +1.27 V.
1. Write down the two half cell reactions
2. Calculate

for this cell
3. Given the data in the table below, calculate

for the formation of Ni2O3
Substance State Go
formation (kJ mol-1
)
Fe Solid 0
FeO Solid -244.3
NiO Solid -216.3
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QUESTION 3: The concentration cell
Cu (s) │CuCl2 (aq., 0.01 M) ║ CuCl2 (aq., concentration ) │Cu (s)
Has a potential of 6 mV at 298K.
(i) Calculate the concentration of CuCl2 in the right-hand half-cell assuming the
activity coefficient of Cu2+ in both sides is 1
(ii) Estimate the mean ionic activity coefficient ± in both sides from the Debye Huckel equation. For the right-hand half-cell use the value of x calculated in (i)
(iii)Using the values of ± calculated in (ii), recalculate the concentration
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Question 4: Cell Discharge
A standard Daniell cell (1 M starting concentration,
= . ) is used until its voltage
has dropped to 1 V. Calculate the concentration of Cu2+ at this voltage.
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QUESTION 5: Thermodynamics Galore!
The values for

(at 298 K) of the reversible cells
Pb,PbCl2(s) KCl(aq) AgCl(s),Ag and Pb,PbI2(s) KI(aq) AgI(s),Ag
are 0.4902 V and 0.2111 V respectively.
Their temperature coefficients are –0.000186 V K-1 and –0.000127 V K-1
, respectively.
The silver electrode is the positive electrode in each cell. Calculate
and at 298
K for the reaction:
PbI2(s) + 2AgCl(s) = PbCl2(s) + 2AgI(s)
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