0.050 mm NaF is having the higher boiling point closer to its predicted value.
Ideally, strong electrolytes (like both NaF and KCl) would dissociate into two ions. However, their behavior in a solution is obviously far from ideal and as a result of that their theoretically determined boiling point and the actually observed one will often be slightly different. Change is explained with positive ions being clustered around negative ones and vice versa therefore forming an ionic atmosphere of net opposite charge.
With this being the reason for the difference between theoretical values and actually observed ones we can conclude that a diluted solution will be have more like an 'ideal' one than the concentrated one. In this case therefore, 0.050 mm will have a boiling point closer to its predicted value.
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