In a book called 400 Hints from Homes the following is given for the removal...

frozen_sun · #1 24-06-2007, 21:35

...of a rust oisten with lemon juice In a book called 400 Hints from Homes the following is given for the removal of a rust oisten with lemon juice, add salt and dry in the sun. Rinse off and repeat if necessary". Explain the chemistry and physics of this operation.

Tickler · #2 25-06-2007, 05:25

Rust (see link for formation process) is nothing but iron(III) oxide Fe2O3, under hydrated form.Adding lemon juice is basically putting an acid (namely citric acid) in aqueous solution on it. The following reactions occur:Fe2O3 + 3H2O -> 2 Fe(OH)3Fe(OH)3 + 3H+ -> Fe(3+) + H2OFe(3+) can then be eliminated by forming a complex with the citrate (or citric acid).I am not sure how the salt helps; it may be here just as a buffer, to keep the ion activity (or concentration) at a high level throughout the process.

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