Unit 2

[naved_s9994]

A solute __________________ of the solvent.   
    a.   raises the freezing point   
    b.   raises the boiling point   
    c.   lowers the boiling point   
    d.   does not affect

Can you explain why also... thanks!

[Edmund]

B.

Using the Boiling-Point elevation formula,

Change in Temp = K . m

where the Change in Temp is the difference in the boiling point of the solution (with solute) and solution (without solute), K is the boiling point constant, and m is the molality.

When an amount of solute is added, molality increases, so change in temp increases too, therefore we expect a higher boiling point...

Hope it makes sense?

[lukeperry91]

When i used to get these questions in year 11, I would just think about the ocean... its harder to freeze/boil it (hence you can have subzero temps in the arctic and why steam doesn't fly off due to evaporation). Edmund's explanation sounds alot more scientific though

[naved_s9994]

yea thanks both!
Edmund +1