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Discussion. Magnesium reacts with hydrochloric acid according to the equation: Mg (s) + 2 HCl (aq MgCl 2 (aq) + H 2 (g) This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas.lace the Petri dish on the overhead projector. Pour hydrochloric acid into the Petri dish to a depth of about 5mm. Turn on the projector and focus it. Using forceps, place the magnesium ribbon into the Petri dish.
Metals in Hydrochloric Acid. Hydrochloric acid dissolves some metals to form oxidized metal chlorides and hydrogen gas, the latter of which is visible in the animation as bubbles floating to the surface.e the first to rate this resource! Hydrochloric acid dissolves some metals to form oxidized metal chlorides and hydrogen gas, the latter of which is visible in the animation as bubbles floating to the surface.