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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Jul 2007 13:03:43 IST
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what is the formula of urea and what is it vant'off factor???? pls also explain me how to find the vant hoff factor for typical compunds. i will definitely rate everybody.
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3 Jul 2007 13:24:43 IST
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NH2CONH2
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3 Jul 2007 13:28:53 IST
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see..if a compound undergoes dissociation or association in a solvent...then no. of particles are changed...so colligative property changes....now to find the correct colligative effect...
i= observed effect/normal effect=(no. of moles after association or diss./initial moles)
also note that moles and molecular mass have inverse relation ...so...
i= normal mol. mass/ observed molar mass
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3 Jul 2007 13:33:01 IST
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eg...
KCl dissociates into K+ and Cl- ...so i = (1+1)/1=2
dep. in freezing point= iKm
osmotic pressure= iCRT
(P0 -P)/p0 = i X
note that i have done by no. of moles...
if u want to do using malar mass...than position of i will be on LHS
acetic acid in benzene forms a dimer...
If the substance does not fully associate or dissociate..than degree of dissociation comes into play...
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3 Jul 2007 13:56:49 IST
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if a compound undergoes dissociation then degree of dissociation = i -1/n -1 n= number of dissociated particles, i =vanthoff factor if association takes place forming dimer or trimer then degree of association =i -1/1/n -1 hope this will help you plse rate me
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3 Jul 2007 15:31:30 IST
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van't hoff factor for urea is 1.
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3 Jul 2007 17:26:11 IST
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van't hoff factor is defined as the ratio of experimentalk value of the colligative prperty to the calculated value of colligative property..... i = obs. value of coll. property / notmal value of same property a) Calculation of degree of dissociation ..  = i - 1 / n - 1 b)calculation of degree of association... = n - ni / n - 1
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