Sodium Chlorite vs. Chlorine Dioxide I ordered Sodium Chlorite in the mail and received Chlorine Dioxide. Can they be used interchangeably, or are they different? My background in chemistry is limited so laymen's terms would be appreciated. I appreciate any responses or feedback.
Sodium Chlorite is a white powder, which dissolves in water.

Chlorine Dioxide is a gas. This gas also dissolves in water to some degree and gives a yellow color.

Sodium Chlorite is used to make Chlorine Dioxide in the laboratory.

I strongly doubt, that someone has sent you Chlorine Dioxide, as it is to dangerous to store and to send.