| 1 | Or add iron to hydrochloric acid and boil the solution to dryness. | |
| 2 | 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. | |
| 3 | These small tablets contain one drop of hydrochloric acid and they last about four hours. | |
| 4 | Your stomach cells secrete hydrochloric acid, a corrosive compound used to treat metals in the industrial world. | |
| 5 | In fact, the chlorine produced by mixing hydrochloric acid and chlorine bleach is what will dissolve the gold to form gold(III) chloride. |
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