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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: hoku123 on January 19, 2006, 04:07:09 PM

Title: Van T Hoff Factor
Post by: hoku123 on January 19, 2006, 04:07:09 PM

I was wondering if someone could explain in more depth to me.  I know it has to do with solubility rules and perhaps multiplying by the molality, but other than that I am lost.  In particular, I am looking fo rthe Van T hoff factor of LiCl in 1 L of Water.  I have .154 moles of it.  Thanks for the help.

-Colin

Title: Re:Van T Hoff Factor
Post by: plu on January 20, 2006, 10:19:41 AM

The Van T. Hoff factor can be calculated in a number of ways.  A common method used is to analyse the freezing point depression of an ionic solvent in a particular solute.  Freezing point depression can be calculated to be:

deltaT = (i)(K)(C_m)

where "i" is the Van T. Hoff factor, K is the freezing point depression constant for the solute, and C_m is the molal concentration of the solvent.  By measuring, deltaT, "i" can be easily calculated for a particular solvent.