5.Is the rate constant(K) under all conditions? Kinetics of Hydrolysis of t-Buty

Question

5.Is the rate constant(K) under all conditions?

Kinetics of Hydrolysis of t-Butyl Chloride Introduction: When tert-butyl chloride is dissolved in aqueous acetone, it reacts to form tert- butyl 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 tert-butyl chloride concentration. 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 tert-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.

Explanation / Answer

The rate constant of a reaction is constant for a given reaction at a specific temperature. The rate constant only changes if the temperature at which the reaction proceeds changes.

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