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Question
Electra made a concentrated solution of ZnSO4 and calculated the EMF of Zn2+Zn half-cell using experiments. This time she was certain that the experiment was right. She still tried to verify it using her master Nernst's equation. She found it was inaccurate! She concluded that Nernst equation must be wrong or inapplicable in this case.
Her conclusion is right.
Electra made a concentrated solution of ZnSO4 and calculated the EMF of Zn2+Zn half-cell using experiments. This time she was certain that the experiment was right. She still tried to verify it using her master Nernst's equation. She found it was inaccurate! She concluded that Nernst equation must be wrong or inapplicable in this case.
Her conclusion is right.
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Solution
The correct option is A True
Remember that Nernst equation is only applicable only to very dilute solutions. Extra knowledge: Ions of opposite charge tend to associate into loosely-bound ion pairs in more concentrated solutions, thus reducing the number of ions that are free to donate or accept electrons at an electrode. For this reason, the Nernst equation cannot accurately predict half-cell potentials for solutions in which the total ionic concentration exceeds about 10−3M.
Remember that Nernst equation is only applicable only to very dilute solutions. Extra knowledge: Ions of opposite charge tend to associate into loosely-bound ion pairs in more concentrated solutions, thus reducing the number of ions that are free to donate or accept electrons at an electrode. For this reason, the Nernst equation cannot accurately predict half-cell potentials for solutions in which the total ionic concentration exceeds about 10−3M.
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