List the species present in order of increasing concentration in a 0.1 M solution of H₂Se. A)H₂Se

Question

List the species present in order of increasing concentration in a 0.1 M solution of H₂Se. A)H₂Se < HSe- < Se²⁻ B)H₂Se < Se²⁻ < HSe⁻ C)Se^2- < HSe- < H₂Se D)HSe- < Se^2- < H₂Se E)Se²⁻ < H₂Se < HSe⁻

Quizplus · Accepted Answer

The species present in the solution are H₂Se, HSe-, and Se²⁻. To determine the order of increasing concentration, consider the relative strengths of the acids and bases present. HSe- is a stronger base than H₂Se, so it will be present in lower concentration. Similarly, Se²⁻ is a stronger base than both H₂Se and HSe-, so it will be present in the lowest concentration. Therefore, the correct order of increasing concentration is Se^2- < HSe- < H₂Se, which is given in choice C.

List the Species Present in Order of Increasing Concentration in a 0.1