From Amps and a Clock to Grams

You'll learnhow to convert a current and a time into a mass of plated metal — through four gates, two of which are the ones everyone skips.

A current and a stopwatch are enough to predict, to three figures, how much copper will appear on an electrode. The chain is four conversions long and entirely mechanical, and two of its gates are the two that get walked past. Twelve short steps; press Next for each one.

12 STEPS · 6 QUICK CHECKS · q = It · ÷96 485 · ÷n · ×M · v2

charge · then electrons · then atoms · then grams

Before you start

What you're looking at

A plating cell with a power supply driving copper out of solution onto an electrode.

The question

2.0 A for 30 minutes. How much copper ends up on that electrode?

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