Certainly you could put out a fire by hosing it down with something that will remove the heat and block the air from the source of the fire. Vinegar would do that if you had enough of it. A strong acid would do the same thing, but depending on what was burning you may find that the results would be worse than the fire.
Does acid put out fire? Share Facebook; Twitter; Linkedin; copy link. Save Comment Bob Collier. Follow. Acids ain’t just acids. Vinegar is an acid. You can pour it all over yourself without significant negative consequences. … Vinegar is an acid. You can pour it all over yourself without significant negative consequences.
Is Acid Flammable? (Hydrochloric) – Firefighter Insider
Hydrochloric acid is not considered to be a fire hazard under normal conditions. This is because it’s an aqueous solution, that is the hydrogen chloride is dissolved in water. The water is present in sufficient quantity that any fire is likely to be self-extinguishing and thus, it’s not a fire hazard.
It depends upon the source of the fire, and the type and strength of the acid. Pouring vinegar on a dry wood fire will probably make a steamy eye-and-nose-irritating stink, but it would likely put out the fire. Pouring fuming nitric acid onto the same fire could well be lethal. The fumes will erode, especially, the moist tissues of lungs and mucosa.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher