Acids react with most metals. When an acid reacts with a metal, the products are a salt and hydrogen. This is the general word equation for the reaction:metal + acid → salt + hydrogen ...

It is highly water-soluble and a strong acid with a pK a of –2.8. It has been known since at least the 1880s; its synthesis, which goes back to 1916, is via the reaction of benzene with hot ...