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Q.

1dm3 of 2 M CH3COOH is mixed with 1 dm3 of 3 M ethanol to form ester. The initial rate if each solution is diluted with an equal volume of water, would become

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a

2 times

b

4 times

c

0.25 times

d

0.5 times

answer is C.

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Detailed Solution

  • When each solution is diluted by equal volume of water, the concentration of each chemical is reduced to half the original.
  • This is an elementary reaction which leads to the conclusion that the order of this reaction would be 2.
    The rate equation is v=k[CH3COOH]1×[C2H5OH]1. Hence the rate decreases by a factor of 1/2×1/2=1/4=.25
    Thus the rate after dilution will be 4 times lesser than earlier rate.
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