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I will be attempting rust removal from a steel gas tank of about 5 liters by means of electrolysis, with steel wire acting as the anode.

For the electrolyte I've been advised to dissolve $\ce{Na2CO3}$ in water. Approximately what should the concentration be? Just looking for a ballpark estimate.

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    $\begingroup$ I've seen 4 grams per liter (roughly 1 tablespoon per gallon for my countrymen and the 15 remaining people in the world still not on the metric system). You might find Rust Removal Using Electrolysis of interest and/or helpful. Good luck! $\endgroup$ – Todd Minehardt Sep 29 '16 at 19:12

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