Consider separate solutions of 0 . 500   M   C 2 H 5 OH   aq ,   0 . 100   M  …

Consider separate solutions of 0.500 M C2H5OH aq, 0.100 M Mg3PO42 aq, 0.250 M KBr aq and 0.125 M Na3PO4 aq at 25°C. Which statement is true about these solutions, assuming all salts to be strong electrolytes?
  1. They all have the same osmotic pressure.
  2. 0.100 M Mg3(PO4)2 aq has the highest osmotic pressure.
  3. 0.125 M Na3PO4 aq has the highest osmotic pressure.
  4. 0.500 M C2H5OH aq has the highest osmotic pressure.

Solution

Osmotic pressure  π=iCRT(i is  Van't  Hoff factor, C is concentration)

π=iC at same temperature.

C2H5OH=1x0.5=0.5Mg3(PO4)2=5x0.1=0.5KBr=2x0.25=0.5Na3PO4=4x0.125=0.5

The solutions are isotonic as they have the same osmotic pressure.
 

Asked in: JEE Main 2014 (06 Apr)

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