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  • one gram atom of calcium was burnt in excess of air dissolved in water and made up to exactly one liter its normality is

one gram atom of calcium was burnt in excess of air dissolved in water and made up to exactly one liter. its normality is

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Normality , indicates the concentration of a solution. It is defined as the gram equivalent weight per liter of solution.

The Reaction for the Chemical Process is:

Ca+ 1/2 O_2 =CaO\\ CaO +H_2O = Ca(OH)_2


The weight of Ca =40 g
The molar weight of CaO =40 +16 =56 
Molar weight of Ca(OH)_2  = 74
40 grams of Ca produces 74 grams of Ca(OH)_2
1 gram of Ca is equivalent to 74/40 gram Ca(OH)_2  = 1.85
Or

1.85/37 = 0.05 gram equivalent of Ca(OH)_2  Equivalent weight of Ca(OH)_2  is  37.
Therefore if 0.05gram is dissolved in 1Lit we get  0.05N  Ca(OH)_2  solution.


This can be verified as

0.05N Ca(OH)_2 equals 0.05*37 =1.85 gram and Ca(OH)_2 =40/74*1.85 =1gram Ca.

 

So , Normality=0.05N

 

Posted by

sudhir.kumar

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