Which of the changes listed below has no effect on the equilibrium for the following reversible reaction in an aqueous solution? HNO₂(aq) H+(aq)+ NO₂-(aq)

Question

Which of the changes listed below has no effect on the equilibrium for the following reversible reaction in an aqueous solution? HNO₂(aq)  H+(aq)+ NO₂-(aq)

Quizplus · Accepted Answer

The addition of solid NaCl has no effect on the concentrations of HNO₂, H⁺, and NO₂⁻ because it does not participate in the reaction. Only A, B, and E would cause a shift in the equilibrium because they alter the concentrations of the reactants or products. The addition of NaNO₂ would shift the equilibrium to the left by temporarily increasing the concentration of NO₂⁻, which would cause the HNO₂ to react with the excess NO₂⁻ to form more H⁺ and HNO₂. The addition of NaOH would shift the equilibrium to the right by reacting with H⁺ ions, decreasing their concentration and driving the reaction to form more H⁺ and NO₂⁻.

Which of the Changes Listed Below Has No Effect on the Equilibrium