depression in freezing point for 1 molar concentration of Urea, 1 molar concentration of glucose and 1 molar concentration of NaCl are in the ratio

depression in freezing point for 1 molar concentration of Urea, 1 molar concentration of glucose and 1 molar concentration of NaCl are in the ratio SUDHA ALCHEMY 'SHRI Solutions and Colligative Pr L The molar mass of NaCI determined by colli- gative property measurement will be a) equal to 58.5 '—-63<58.5 d) Can't be measured c) < 58.5 2. The depression in freezing point for 1M urea , 1M glucose and 1M NaCl are in the ratio The values of observed and calculated mole- cular weights of silver nitrate are 92.64 and respectively. The degrees of dissociation Of silver nitrate will be a)700/0 c) 83.5% d) If osmotic pressure of IM urea is 7t , what w • be the osmotic pressure for 0.1 M INaCV?— b) 0.02 7t C) 2 Tt nhe degree of dissociatiou-(a of a weak el •olyteAxByis Van?tHoff factor C

Dear Student,

Since all the 3 have the same concentration the ratio of the depression in freezing point will be equal to that of vant hoff facto.
Where, van't Hoff factor is the number of molecules, that on average result upon solvation of compound in solution.

Urea is non-electrolyte so, i=1
Glucose also has i = 1
NaCl gives Na+ and cl- so, i=2 (add the ions)
We know that Tf=iKf⋅m (where Kf and m are equal in all).
 

For Urea Tf = 1 x 1m x K f= 1Kf
For Glucose Tf = 1 x 1m x K f= 1Kf
For NaCl Tf = 2 x 1m x K f= 2Kf

Therefore the ratio of the depression in freezing point is 1:1:2 ( option 1)

Regards

.


 

  • 1
What are you looking for?