Or add iron to hydrochloric acid and boil the solution to dryness.

We now dissolve everything in a mixture of hydrochloric acid at 35% and chlorine bleach (sodium hypochlorite) at 5%, in a proportion of 2 to 1.

These small tablets contain one drop of hydrochloric acid and they last about four hours.

Your stomach cells secrete hydrochloric acid, a corrosive compound used to treat metals in the industrial world.

In fact, the chlorine produced by mixing hydrochloric acid and chlorine bleach is what will dissolve the gold to form gold(III) chloride.