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Potentiometry is to be used to determine the concentration of a metal dication, M2+, in water. The...

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Chemistry

Potentiometry is to be used to determine the concentration of ametal dication, M2+,
in water. The table below shows the dependence of the cellpotential on [M2+]
(please note some data has been deliberately omitted).

[M2+] / mol l-1ECell / V
1
0.5-0.295
0.1-0.309
0.05-0.325
0.025
0.01-0.349
0.005-0.354

Q 2(a)
With the aid of a graph, determine the Nernst slope and theStandard Cell Potential,
Eo’. Comment on the values obtained and state the number ofelectrons transferred.

Q 2(b)
Clearly explaining your reasoning, use the graph to estimate thepotentials that are
missing in the table. Comment on the likely accuracy of yourpredictions.

Q 2(c)
The Standard Cell Potential for Cd2+/Cd is -0.43V, for Pb2+/Pb is-0.29 V and for
Cu2+/Cu is +0.34 V. Clearly explaining your reasoning, determinethe likely identity
of the metal cation.

Q 2(d)
If the potential measured for an unknown solution is -0.318 V,determine the
concentration of M2+ in the sample.

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