Question

Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points from highest to lowest freezing points. LiNO3, Li3PO4, K2CO3

Answer 1

Colligative properties of solution for freezing points: It doesn't matter what the solute, just how much there is. More solute will lower the freezing point.

LiNO3= 2 ions

Li3PO4 --> 3Li3+ + PO4^3-= 4 ions

K2CO3 (s) ---> 2K+ (aq) + CO32- (aq)=3 ions

Since they have equal concentrations,

Highest freezing point, the ones that will freeze first -----> Lowest

LiNO3>K2CO3>Li3PO4