List the species present in order of increasing concentration in a 0.1 M solution of H₂C₂O₄. A)H₂C₂O₄

Question

List the species present in order of increasing concentration in a 0.1 M solution of H₂C₂O₄. A)H₂C₂O₄ < HC₂O₄⁻ < C₂O₄²⁻ B)H₂C₂O₄ < C₂O₄²⁻ < HC₂O₄⁻ C)C₂O₄²⁻ < HC₂O₄⁻ < H₂C₂O₄ D)HC₂O₄⁻ < C₂O₄²⁻ < H₂C₂O₄ E)C₂O₄²⁻ < H₂C₂O₄ < HC₂O₄⁻

Quizplus · Accepted Answer

The species present are HS1U1B12S1U1B0CS1U1B12S1U1B0OS1U1B14S1U1B0, HCS1U1B12S1U1B0OS1U1B14S1U1B0S1U1P1−S1S1P0 and CS1U1B12S1U1B0OS1U1B14S1U1B0S1U1P12−S1S1P0. 
To arrange in order of increasing concentration, we need to consider the number of ions produced by each species upon dissociation. 
HS1U1B12S1U1B0CS1U1B12S1U1B0OS1U1B14S1U1B0 produces 1 H+ ion and 1 HS1U1B12S1U1B0CS1U1B12S1U1B0OS1U1B14S1U1B0- ion. 
HCS1U1B12S1U1B0OS1U1B14S1U1B0S1U1P1−S1S1P0 produces 1 H+ ion, 1 HCS1U1B12S1U1B0OS1U1B14S1U1B0- ion and 1 S1U1P1- ion. 
CS1U1B12S1U1B0OS1U1B14S1U1B0S1U1P12−S1S1P0 produces 1 CS1U1B12S1U1B0OS1U1B14S1U1B0- ion, 1 S1U1P1- ion, and 2 H+ ions. 
Therefore, the concentration of species in decreasing order is CS1U1B12S1U1B0OS1U1B14S1U1B0S1U1P12-S1S1P0 < HCS1U1B12S1U1B0OS1U1B14S1U1B0S1U1P1−S1S1P0 < HS1U1B12S1U1B0CS1U1B12S1U1B0OS1U1B14S1U1B0. The correct choice is C.

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