The concentration of a chemical degrades in water according to first-order kinetics. The degradation constant is 0.2 day-1. If the initial concentration is 100.0 mg · L-1, how many days are required for the con - centration to reach 0.14 mg · L-1?

Question

Chemistry

Rowan Lee

7 April, 05:18

The concentration of a chemical degrades in water according to first-order kinetics. The degradation constant is 0.2 day-1. If the initial concentration is 100.0 mg · L-1, how many days are required for the con - centration to reach 0.14 mg · L-1?

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Answers (1)

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Bronson Gray · Answer 1

3566.4 days

Explanation:

The reaction follows a first-order

Rate = kC = change in concentration/time

k = 0.2 day^-1

C = 0.14 mg. L^-1

Co = 100 mg. L^-1

0.2*0.14 = 100 - 0.14/t

t = 99.86/0.028 = 3566.4 days