30. A Daniell cell initially has 1.0 M and 1.0 M . If sufficient aqueous is added exclusively to the — Electrochemistry Chemistry Question
Question
30. A Daniell cell initially has 1.0 M $Zn^{2+}$ and 1.0 M $Cu^{2+}$. If sufficient aqueous $NH_3$ is added exclusively to the cathode compartment, how will the operating cell potential be affected?
Answer: B
💡 Solution & Explanation
Adding $NH_3$ to the $Cu^{2+}$ compartment forms the stable complex $[Cu(NH_3)_4]^{2+}$, drastically reducing the concentration of free $Cu^{2+}$ (the reactant). A lower reactant concentration decreases the overall cell potential $E_{cell}$.
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