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Question

Acetic acid undergoes 25% dissociation and 30% association simultaneously. What will be the value of vant Hoff factor 'i'?

A
0.65
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B
0.11
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C
1.01
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D
1.10
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Solution

The correct option is D 1.10
Let total amount of CH3COOH be x . 25% dissociation, α=25100x=0.25x30% association, α=30100x=0.3x
dissociation CH3COOHCH3COO+H+
t=0x00t=tx0.25x0.25x0.25xt=t0.75x0.25x0.25x
association:-
2CH3COOHCCH3(00H)2
t=t0.75x0.30x0.30x2x
t=t0.45x0.15x
Initial amount =x
Final amoun t=(0.25+0.25+0.13
+0.45)x
=1.10x
i= initial amount Final amount =110xx=1.10



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