# What is created when “Iron-Out®” is mixed with household bleach?

I accidentally mixed bleach in a toilet bowl that had Iron-Out in it. The gas almost overwhelmed me, and left me gasping for breath for a good 15 minutes. What in the heck did I create with those two chemicals?

• This is potentially quite serious. Some people can have severe idiosyncratic reactions to sulfur dioxide. Go to ER right now. If you start to have breathing difficulties again, call an ambulance. – Securiger May 14 '17 at 10:36

Upon the action of bleach, you likely generated sulfur dioxide, gas with pungent smell. Refraining from a remote diagnosis, but if you accident happened in a less ventilated space and you inhaled a lot, consultation of a physician may be adequate as sulfur dioxide ($\ce{SO2}$) is harmful and maybe you equally inhaled vapours of bleach, too. Likely, mixing "iron out" and bleach together yielded a considerable heat, too.