A student prepares a solution by combining 100 ml of 0.30 M

Last updated: 7/28/2022

A student prepares a solution by combining 100 ml of 0.30 M HNO₂ (aq) and 100 mL of 0.30 M KNO₂ (aq). Which of the following equations represents the reaction that best helps to explain why adding a few drops of 1.0 M HCl (aq) does not significantly change the pH of the solution? (A) K+(aq) + Cl–(aq) → KCI(s) (B) H+(aq) + OH–(aq) → H₂O(l) (C) HNO₂(aq) → H+(aq) + NO₂– (aq) (D) H+(aq) + NO₂– (aq) → HNO₂(aq)