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Question Description

It takes 805.3 s for a 1.00-A current to plate 0.2652 g of a metallic element from a solution containing M2+ ions.

What is the element (M)? Answer with the chemical symbol for the element.

Final Answer

Total charge = 1.00 A * 805.3 s = 805.3 C. The Faraday's number is 96435 C/mol.

Find how many moles of metallic ions are reduced (note that each ion must get 2 electrons to reduce to an atom):  805.3 C / (2* 96435 C/mol) = 0.004175 mol (contained in 0.2652 g of the element M).

Find the atomic mass of the element M: 0.2652 g / 0.004175 mol = 63.5 g.mol. From the periodic table, the element M is copper. Note that copper indeed has Cu 2+ ions.

Answer: Cu.

repet22 (1096)
Carnegie Mellon University

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