The total concentration of ions in a 0.250 M solution of HCl is .
A) 0.250 M
B) 0.500 M
C) 0.125 M
D) essentially zero.
E) 0.750 M

Question

Quizplus · Accepted Answer

According to the equation for the dissociation of HCl in water:
HCl → H+ + Cl-
Each HCl molecule dissociates into one H+ ion and one Cl- ion, so the concentration of H+ ions and Cl- ions is 0.250 M each. Therefore, the total concentration of ions in the solution is 0.250 M + 0.250 M = 0.500 M.

The Total Concentration of Ions in a 0