The balanced chemical equation for this reaction is Mg (s) + 2 HCl (aq) produces MgCl 2 (aq) + H 2 (g), where the letter "s" stands for solid, "g" is gas and "aq" represents an aqueous solution. The balanced chemical equation for the reaction between magnesium hydroxide and hydrochloric acid is Mg(OH)2 + 2HCl --> MgCl2 + 2H2O. When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. If 3.85 mol Mg and 3.85 mol of HCl are reacted, how many mol of oxygen are left over? What happened to the rest of the mass The chemical reaction between hydrochloric acid and magnesium produces magnesium chloride and hydrogen gas. I balanced the equation and got Mg(OH)2+2HCl=MgCl2+2H2O. Single replacement reactions can be represented by the simple chemical equation FY + C produces F + CY. The equation for the reaction is: magnesium + hydrochloric acid → magnesium chloride + hydrogen. You try it! Write the balanced chemical equations with state symbols for the following reactions :