The same current was passed successively through solution of zinc–ammonium sulphate and nickel–ammon — Electrochemistry Chemistry Question
Question
The same current was passed successively through solution of zinc–ammonium sulphate and nickel–ammonium sulphate rendered alkaline with ammonia. The weights of zinc and nickel deposited in a certain time were found to be 22.89 g and 20.55 g, respectively. Given that the chemical equivalent weight of zinc is 32.7, what is the chemical equivalent weight of nickel?
Answer: B
💡 Solution & Explanation
According to Faraday's Second Law of Electrolysis, the ratio of masses deposited is equal to the ratio of their equivalent weights: $W_{Zn} / E_{Zn} = W_{Ni} / E_{Ni}$. Substituting the values: $22.89 / 32.7 = 20.55 / E_{Ni}$. $0.70 = 20.55 / E_{Ni} \Rightarrow E_{Ni} = 20.55 / 0.70 \approx 29.357$. Therefore, correct answer is B.
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