For example, when magnesium reacts with hydrochloric acid ... (potassium and sodium) with acid in a lab. As you move down the reactivity series (aluminium, zinc, iron) the metals are less reactive ...

Explain why, in a test for sulfate ions, the sample is acidified with hydrochloric acid first. Carbonate ions also produce a white precipitate with barium chloride solution. The acid reacts with ...