Hydrazoic acid is a chemical compound. (It is similar to hydrogen azide, which is the gas form. Hydrazoic acid is hydrogen azide dissolved in water.) Its chemical formula is HN3. It contains hydrogen and azide ions.
It does not have many uses, because it is very explosive and toxic.
Hydrazoic acid is extremely toxic, even more toxic than sodium azide. It can make very bad headaches. It has a bad odor. It does not accumulate in the body.