Pseudo First Order
Mediumchemistry
Hydrolysis of ethyl acetate in presence of excess water follows pseudo first-order kinetics because:
Select the correct option:
Solution
Incorrect! Answer:
Water concentration remains constant
Reaction: CH3COOC2H5+H2OH+CH3COOH+C2H5OH
- The experimental rate law is \text{Rate} = k [CH_3COOC_2H_5] [H_2_O].
- When water is in large excess, its concentration does not change significantly during the reaction.
- Thus, [H2O] can be considered constant and absorbed into the rate constant: Rate=kobs[CH3COOC2H5], where kobs=k[H2O].
- Such a reaction, which is higher order but behaves as first order, is called a Pseudo First-Order Reaction.
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About This Question
- Subject
- chemistry
- Chapter
- chemical kinetics
- Topic
- pseudo first order
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Water concentration remains constant
Reaction: CH3COOC2H5+H2OH+CH3COOH+C2H5OH
- The experimental rate law is \text{Rate} = k [CH_3COOC_2H_5] [H_2_O].
- When water is in large excess, its concentration does not change significantly during the reaction.
- Thus, [H2O] can be considered constant and absorbed into the rate constant: Rate=kobs[CH3COOC2H5], where kobs=k[H2O].
- Such a reaction, which is higher order but behaves as first order, is called a Pseudo First-Order Reaction.
This medium difficulty chemistry question is from the chapter chemical kinetics, covering the topic of pseudo first order. It appeared in the 2025 exam.
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