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From a measurement of the freezing point depression of benzene, the molecular weight of acetic acid on a benzene solution was determined to be 100. The percentage association of acetic acid is :-

Asked by Atulcaald 15th May 2018, 12:10 AM
Answered by Expert
Answer:
Given :
Observed molecular weight = 100
Now for,
2 C H subscript 3 C O O H space leftwards arrow over rightwards arrow from blank to blank of space space left parenthesis C H subscript 3 C O O H space right parenthesis subscript 2
Before association 0
 
After association α/2 [degree of association]
 
therefore space M subscript n o r m a l end subscript over M subscript o b s e r v e d end subscript space space equals 1 minus alpha space plus space alpha divided by 2

space therefore 60 over 100 space equals space 1 minus alpha space plus space alpha divided by 2

space space space 0.6 space equals space 1 minus alpha space plus space alpha divided by 2

0.6 space equals space fraction numerator 2 space minus space alpha over denominator 2 end fraction

1.2 space equals space 2 space minus space alpha

alpha space equals space 0.8

T h e r e f o r e space percent sign space o f space a s s o c i a t i o n space w i l l space b e space 80 percent sign
Answered by Expert 15th May 2018, 11:28 AM
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