[kfletcher7]

We have to create our own lab write up and experimentally determine the Ka or Kb factor of an unknown solution using three different methods. One of the ways is by freezing point depression. Can someone please explain how you could find the percent ionization using freezing point depression??

[Arkcon]

PK, lets start with what you know (or can find in your textbook) on how something dissolved in a liquid depresses the freezing point.  Look for a formula, and see what that formula depends on.  Then come up with a way to relate that to Ka of the solute in the liquid.  That's the whole assignment, right?  You have to come up with the method yourself, according to your description of the assignment.

[kfletcher7]

Okay so I get that ΔT=iKfm and I know how to use the freezing point depression to find i and the molality. Then my book gives me the the equation m(effective)=i*m(stated concentration). So if the original concentration is .1 m we can times by the i we found and get the effective m which says it is the sum of the molalities of HA, H+ and A- but i don't know how to take that m(effective) and put it in an ICE table or something to find the Ka value.