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(a) A solution contains 5.85\; g\; NaCl (Molar mass 58.5\; g\; mol^{-1}) per litre of solution. It has an osmotic pressure of 4.75\; atm at 27^{\circ}C. Calculate the degree of dissociation of NaCl in this solution. 
(Given :R=0.082\; L\; atm\; K^{-1}\; mol^{-1})

(b) State Henry’s law. Why is air diluted with helium in the tanks used by scuba divers ?

 

 
 
 
 
 

Answers (1)

a) π = i CRT

4.75 = i x 5.85/58.5 x 0.082 x 300

i = 1.93

b) Partial pressure of gas in liquid is directly proportional to its solubility or mole fraction. Air is diluted with helium in the tanks used by scuba divers to prevent bends

 

 

Posted by

Safeer PP

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