Question

The fact that a solven has the same Kf and Kb, regardless of the solute dissolved in it makes the assumption that the mixture of solute and solvent form what is referred to as an ideal solution. Just like the idea of an ideals gas you saw before, some solutions are more ideal than others. Oddly enough, though, the conditions that make a solution more ideal are the same conditions that make a gas behave in a more ideal fashion. Drawing a parallel to kinetic molecular theory of gases, explain whether you would expect more ideal behavior from a 0.1M aqueous solution of NaCl or a 2.5 M aqueous solution of NaCl.

Answer 1

A solution of NaCl is expected to be have ideal behaviour. NaCl is a salt formed by the combination of strong base NaOH and a strong acid HCl. The salt remains completely soluble in solution.

NaOH + HCl --> NaCl + H2O

Strong acids and strong bases dissociate completely when in solution. Therefore, NaCl maintains an equal amount of OH- and H+ in solution, making the Ka and Kb the same st all conditions. So both 0.1 M or the 2.5 M NaCl would behave the ssme manner and would have same Ka or Kb.