A .100 molal aqueous solution of which compound has the lowest freezing point

1 answer:

8 0

Missing question:
a. C6H12O6
b. CH3OH 
c. C12H22O11 
d. NaOH.
Answer is: d. NaOH.
b(solution) = 0,1 m.

ΔT = Kf · b(solution) · i.

Kf - the freezing point depression constant.

i - Van 't Hoff factor. Because dissociate on one cation and one anions, sodium hydroxide has i = 2, other molecules has covalent bonds (i = 1, do not dissociate on ions).

Because molality and the freezing point depression constant are constant, greatest freezing point lowering is solution with highest Van 't Hoff factor.

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