explain why the pure solvent shows a level horizontal curve as solidification occurs, but the curve for the solution slopes downward slightly. The solvent is BHT and the added particles are an unknown compound.

My reasoning is that it happens because the added particles cause the solution to cause the solution to freeze at such a low temperature, it keeps on going down.

2 answers

The way you explain it sounds as if the unknown particles lowers the freezing point a huge amount. I think it would be appropriate to say the added particles lower the freezing point in accordance with the colligative property of delta T = i*Kb*m
no