Once it’s open, the drug is useless. ** It's actually a bit more complicated than this. Start with zinc metal and hydrochloric acid. You’ll get zinc chloride. Neutralize that, and a white precipitate ...

Let's look at three metals reacting with three acids. Magnesium plus nitric acid gives us magnesium nitrate. Calcium plus hydrochloric acid gives us calcium chloride. And zinc plus sulphuric acid ...