How Cold Can a 10% Antifreeze Solution Get Before Freezing?

[briteliner]

Homework Statement

your car's radiator uses a mixture of antifreeze (C2H6O2) in water to both lower the freezing point and raise the boiling point of the solution. how cold could it get before a 10 mass % solution of antifreeze in water would freeze? (Kf(H2O)=1.86'C/m)

Homework Equations

The Attempt at a Solution

dont know where to start

 

[=Lawrence=]

You have to use the colligative properties.

ΔTf = i Kf m

http://www.chemistryexplained.com/Ce-Co/Colligative-Properties.html

 

[briteliner]

but what am i looking for?the new freezing point?

 

[=Lawrence=]

but what am i looking for?the new freezing point?

yes, the point at which a solution freezes is defined as it's freezing point. That's what you asked.