Class 12th "Solutions" Chapter no. 02

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HENRY'S LAW : William Henry gave this rule in 1803.
Henry's law is applicable for the solution which are made by dissolving the gaseous solute in the liquid. 
(जब हमारे पास गैस विलेय एवं विलायक कोई द्रव होता है तो उसके लिए हेनरी द्वारा यह नियम दिया गया।) 
•  CO2 dissolved in solvent. 

•  और अगर हमें किसी गैस को solvent में dissolve करना है तो उसके लिए गैस को pressure दिया जाता है। 

• Solvent में उतनी ही गैस dissolve होगी जितना की गैस के ऊपर pressure apply किया गया हो। 

•  x = mole fraction 

•  m = Amount of Gas

•  P = Pressure

Definition of Henry's Law : 
"Amount of the gas is dissolved in the solvent is directly proportional to the pressure applied over the solution."
Mathematical representation is, 
      [m is proportional to p]
      [  m = k.P.   ]

Amount of the gas dissolved in ghe solvent is represent by mole fraction. 
      
        [  x proportional to  p  ]
      [  p is proportional to x  ]


•  2nd definition of Henry's Law : 
   "Pressure applied over the solution is directly proportional to it's mole fraction which is present in the solution."
              [  P = kH.x ]
kH = Henry's constant. 
  x  = mole fraction. 
Application of Henry's Law : 

•  In the production of carbonated bevarages. 

•  In the deep sea diving. 

•  For the climbers or people's living in high altitudes. 

Limitations of Henry's Law : 

•  The pressure should not be too high. 

•  The temperature should not be too low. 

•  The gas should not be chemically combined with solvent. 



Practice Questions : 

Question 1. What is Henry's law give their mathematical representation. Define. 

Question 2.  What is Henry's law applications and limitations. 

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