FYI, Iron readily dissolves in HOCl forming a Ferric salt. Add NH4OH and you will have Fe(OH)3. Dehydrate to obtain Fe2O3, but note that for most
aqueous chemical reactions, the fresh precipitate of Fe(OH)3 may be better (more chemically reactive).
One way to prepare a dilute, but still reactive solution of HOCl (with a presence of Sodium acetate), is by mixing Bleach (NaOCl) and vinegar.
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