A manufacturing line plates nickel metal from a solution onto steel sheets

CHEMISTRY · Multi-part · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

A manufacturing line plates nickel metal from a

\text{Ni}^{2+}

solution onto steel sheets. The current supplied by the rectifier follows the schedule below: • First

2.00\,\text{h}

5.00\,\text{A}

• Next

3.00\,\text{h}

3.00\,\text{A}

After these

5.00\,\text{h}

, the production manager checks the mass of nickel required on each sheet:

15.0\,\text{g}

per sheet. (a) Calculate the total electric charge delivered to one sheet during the first

5.00\,\text{h}

of operation. (b) Determine the mass of nickel actually deposited on one sheet during this period. Assume 100% current efficiency. (c) If the sheet has not yet reached the target mass after the first

5.00\,\text{h}

, compute the additional plating time needed when the current is adjusted to a constant

4.00\,\text{A}

. State your answer in minutes.

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