Answer is:increase [Cl₂] and remove HCl from the product. Chemical reaction: Cl₂ + CH₂Cl₂ → CHCl₃(chloroform) + HCl. According to Le Chatelier's Principle, the position of
equilibrium moves to counteract the change, the position of equilibrium
will move so that the concentration of reactants decrease (Cl₂) and concentration of
products of chemical reaction increase (CHCl₃) if increase concentration of reactants and decrease concentration of products.