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According to Le Chatelier's principle, adding additional reactant to a system will shift the equilibrium to the right, towards the side of the products. By the same logic, reducing the concentration of any product will also shift equilibrium to the right.
Also to know is, when a product is added to a system at equilibrium?
a. When a reactant is added to a system at equilibrium at a given temperature, the reaction will shift right to reestablish equilibrium. When a product is added to a system at equilibrium at a given temperature, the value of K for the reaction will increase(scratched) when equilibrium is reestablished.
Also know, how does adding an acid affect equilibrium?
If hydrochloric acid was added to the equilibrium mixture, both hydrogen ions (H +) and chloride ions (Cl -) are being added. Hydrogen ions are on the right hand side of the equilibrium, therefore the equilibrium will shift to the left hand side to compensate, resulting in a higher concentration of reactants.
on addition of water (that causes the instantaneous dilution, therefore a drop in concentration of the free ions, thus decreasing Q), will shift the equilibrium forward in order to bring Q back to the fixed K value (and vice-versa in the case of water evaporating).