Neco Model Questions Vol1 2021 Chemistry Question 7
Practice objective / multiple choice question 7 from the 2021 Neco Model Questions Vol1 Chemistry examination.
A galvanic cell is set up with a zinc electrode immersed in 0.10 M ZnSO₄ solution and a copper electrode immersed in a solution that contains only Cu²⁺ ions originating from the dissolution of a Cu-Ni alloy. The measured cell emf at 25 °C is 1.05 V. The standard reduction potentials are \(E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76\;\text{V}\) and \(E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34\;\text{V}\). (a) Determine the concentration of Cu²⁺ ions in the copper half‑cell. (b) If the solution volume is 250 mL and the alloy is 80 % Cu by mass, calculate the mass of alloy that must have dissolved to give this Cu²⁺ concentration. Assume the alloy contains only Cu and Ni.
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This is Neco Model Questions Vol1 2021 Chemistry Question 7. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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