The free acid, chlorous acid, HClO2, is only stable at low concentrations. However, the corresponding sodium salt, sodium chlorite, NaClO2 is stable and inexpensive enough to be commercially available. Sodium chlorite is derived indirectly from sodium chlorate, NaClO3. First, the explosive (only at concentrations greater than 10% in atmosphere)chlorine dioxide, ClO2 is produced by reducing sodium chlorate in a strong acid solution with a suitable reducing agent ( sodium sulfite, sulfur dioxide, or hydrochloric acid). The chlorine dioxide is then absorbed into an alkaline solution and reduced with hydrogen peroxide (H2O2), yielding sodium chlorite.
Thank you so much Prof. Mushtaq Ahmad for this answer. I need to prepare NaClO2 which has a wide applications in life. One of these applications is the instant preparation of ClO2 which is difficult to keep as you mentioned. So- I am looking for a direct or indirect method to prepare NaClO2 (the main source of ClO2). BUT I will try what U mentioned for preparation. Do you have detailed text about this? (book or chapter in a book)? I appreciate very much your help.
some details are given;
http://www.madehow.com/Volume-6/Sodium-Chlorite.html
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