The equilibrium shift if the HCl concentration is increased to the product.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
If the concentration of a substance is changed, then the equilibrium will shift in such a way that it minimise the effect of change which occur. If we increase the concentration of a reactant, then the equilibrium will shift to minimize the changes in the direction of the reaction which uses the reactants, so that the reactant concentration decreases.
Thus, we concluded that with increase in the concentration of reactant equilibrium shift forward.
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