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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.
Only a very small percentage of the acid molecules change into ions: CH 3 COOH(aq) CH 3 COO-(aq) + H + (aq) â´ hydrochloric acid is a strong acid, ethanoic acid is a weak acid. A strong acid is an acid which completely ionizes in water. A weak acid is an acid which only partly ionizes in water. The three mineral acids (HCl, HNO 3 , H 2 SO 4 ) are strong acids, as they fully or highly ionize in water.