3D Periodic Table
How to Make Anhydrous Ferrous Chloride
Pretty much! If there's an excess of HCl in solution and oxygen is added, either through air or by something like hydrogen peroxide, the ferrous chloride becomes ferric chloride, which seems to be the exact same chemical commercial etchants use. Interestingly enough, this process is reversible thought pretty much the same way an etchant functions, by using a metal to turn the ferric chloride back into the ferrous form, which is why you need to keep metallic iron in the solution up until is dries. It mostly reverses the effect that any air has on the solution.
How to Make Anhydrous Ferrous ChlorideView Instructable »
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