In: Chemistry
Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. Li2CO3 NaNO3 Na3PO4
Let us consider the dissociation
Li2CO3 2Li+ + CO32- (3 ions)
NaNO3 Na+ + NO3- (2 ions)
Na3PO4 3Na+ + PO43- (4 ions)
More the number of ions, lower is the freezing point.
Therefore, NaNO3 has highest freezing point followed by Li2CO3 and then Na3PO4 has the lowest.