"Chlorine dioxide is a gas that does not occur naturally in the environment. It is used to disinfect drinking water and make it safe to drink. Chlorite is formed when chlorine dioxide reacts with water."
"Chlorine dioxide is a yellow to reddish-yellow manufactured gas. It does not occur naturally in the environment. When added to water, chlorine dioxide forms chlorite ion, which is also a very reactive chemical."
"In water, chlorine dioxide quickly forms chlorite."
"The EPA has set a maximum contaminant level of 1 milligram of chlorite per liter (1 mg/L) and 0.8 mg/L for chlorine dioxide in drinking water."
"In water treatment, chlorite is one of the chemicals involved in the process of generating chlorine dioxide. Chlorite is also the byproduct of disinfection with chlorine dioxide, with about 70% of the chlorine dioxide converted to chlorite and about 30% converted to chlorate (ClO3-) and chloride (Cl-). Though chlorine dioxide is consider to be a powerful disinfectant, chlorite is a weak bactericidal agent.
Another source of chlorite in the environment is the bleaching of wood pulp by paper mills."
Also, in terms of naming molecules, most (if not all) that have an "ate" or "ite" ending are salts.
So, the salts that are referred to in chapter 14, is chlorite, plus small amounts of several of other salts which are named above. The NaClO2 that you start with, is chlorite, I believe.