First write the balanced reaction. Then calculate the moles of each reactant (volume X molarity, write units) and determine if one is in excess (the other will be the limiting reactant). If HCl is in excess, the solution will be acidic after the reaction. If Mg(OH)2 is in excess, the solution will be basic after the reaction. If neither is in excess, the solution will be neutral after the reaction because no unreacted HCl or Mg(OH)2 will remain. |
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