Question: 1. Adding 3 elementary steps given in introduction, write the overall

Question

Question:

1. Adding 3 elementary steps given in introduction, write the overall (sum) equation

2. Is the rate constant (k) constant under all conditions?

Kinetics of Hydrolysis of t-Butyl Chloride Introduction When tect-butyl chloride is dissolved in aqueous acetone, it reacts to form tectbutyl alcohol and hydrochloric acid according to the mechanism shown below. Note that the first step (carbocation formation) is rate limiting. This step is unimolecular and therefore first order in regard to tect-butyl chloride concentration. CH CH Slow CH3 CH3 Fast CH3 CH3 H H3 Fast CH3 H CHa Notice that this reaction releases protons (H) into solution. This release of protons offers a convenient method for monitoring progress via reaction with sodium hydroxide and use of a pH indicator. By using a 2:1 molar ratio of tert-butyl chloride to sodium hydroxide, we will be able observe the passage of one half-life through the color change of the pH indicator. In other words the indicator will change color when sodium hydroxide is completely consumed and the hydrolysis of tect-butyl chloride has gone half way to completion. Measurement of the half-life will allow us to calculate the rate constant using the equation below In2 In2 rearrangement to solve for kyields k-

Explanation / Answer

1) overall reaction :-

reaction (1) + reaction (2) + reaction (3)

2) rate constant of a reaction depends only upon temperature and energy of activation of a reaction.Therefore, it is not constant at all conditions.

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