A compound hydrolyzes in water with a rate constant of $1.9 \times 10 ^ { - 3 } \mathrm {~min} ^ { - 1 }$ at pH 6.0 and $26 ^? \mathrm { C }$ . If a freshly prepared solution of the compound has a concentration of 0.086M, what is the percent completion of the reaction after 3 half-lives?

Question

Quizplus · Accepted Answer

After 3 half-lives, $1 - \left(\frac{1}{2}\right)^3 = 1 - \frac{1}{8} = \frac{7}{8}$ or 87.5% of the reaction is complete, which rounds to 87%.

A Compound Hydrolyzes in Water with a Rate Constant Of 1.9