Letter It is). The aqueous solution of sodium chloride has sodium (Na+) and chloride (Cl-) ions, with chloride being a common ion at equilibrium. Thus, the addition of this solution increases the concentration of chloride ions, which, according to Le Chatelier’s principle, shifts the equilibrium to the opposite side to that of the ion being added, that is, to the right side (blue). The other alternatives are incorrect because:
a) Shifts the balance in the direction of decrease, that is, to the left.
b) As the exercise did not inform the enthalpy variation of the process, it is difficult to evaluate the effect of temperature.
c/d) Both deal with increasing water concentration, which would not alter the balance because it is related to all components.