Another Mixing Snafu

I just got nailed on another reaction of household products, this time regular bleach with toilet bleach.  Remember that regular bleach is just sodium hypochlorite dissolved in water:

NaOCl (H2O) ® Na⁺ + OCl^-

OCl^- + H2O ↔ HOCl + OH^-

H⁺ + Cl^- + OCl^- ® OH^- + Cl₂

H⁺ + Cl^- + HOCl ® H₂O + Cl₂

In both of the bottom reactions gaseous chlorine is generated in serious quantities.  This is because often, not always but in this case, which I would have known had I bothered to read the labels instead of just assuming, toilet bleach is fairly concentrated hydrochloric acid.  Needless to say it starting foaming at once, and when I came had just enough to flush before being driven out, coughing and tearing.

Lesson:  read labels on chemicals before using!