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Question

The kinetic study of hydrolysis of ethyl acetate is catalysed by an acid, and is followed by titrating a fixed volume of a reaction mixture with a standard alkali solution, at different intervals of time. The ester hydrolysis is acid catalysed. V0,Vt and V are the volumes of alkali required at t = 0, t = t and t= respectively. Then, match the statements given in Column I with those in Column II.
Column IColumn IIa)V0 is proportional top) Total concentrations of acid initiallypresent and concentration of acidformed at time t.b)Vt is proportional toq) Concentration of acid initiallypresent as the catalystc)(VVt) is proportional tor) Concentration of acid formed afterthe completion of reactiond)(VV0)is proportional tos) Concentration of ester remainingat time t.

A
(a-q, b-p, c-s, d-r)
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B
(a-p, b-p, c-s, d-r)
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C
(a-q, b-q, c-s, d-r)
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D
(a-q, b-q, c-r, d-s)
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Solution

The correct option is A (a-q, b-p, c-s, d-r)
EsterH+ethanol+acetic acid
a0 0 0 V0
a0x x x Vt
0 a0 a0 V
volumemoles
1.
VV0=2a0a0=a0
this represents the amount of acid formed after the completion of the reaction.
2.
VVt=2a0(a0+x)=a0x
Concentration of ester remaining at time t.
3.
V0
Concentration of acid initially present as the catalyst
4.
Vt
Total concentration of the acid initially present and the concentration of acid formed at time t.

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