Question

5. A solution containing 10.2 g of glycerine per litre of a
solution is found to be isotonic with 2% solution of glucose
(molar mass 180). Calculate the molar mass of glycerine.
(PSB 2001)
​

Answer 1

Answer:91.8 g

Since both solutions are isotonic so,  

Π  =1

​  

Π=2

    {osmotic pressure same}

C  

1

​  

RT=C  

2

​  

RT

C  

1

​  

=C  

2

​  

 

Mw×1

10.2

​  

=  

100×180

2×1000

​  

    {2% glucose = 2g in 100 ml solution}

2000

10.2×100×180

​  

=Mw⇒

Molecular weight of glycerin =91.8g

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