Homework Help: chemistry

Posted by Maria on Saturday, January 15, 2011 at 4:34pm.

the concentration of a chemical degrades in water according to order kinetics. the degradation constant is 0.2 day^-1. if the initial concentration is 100.0 mg/L, how may days are required for the concentration to reach 0.14 mg/L?

chemistry - DrBob222, Saturday, January 15, 2011 at 7:56pm
You didn't post the order.
chemistry - Maria, Saturday, January 15, 2011 at 11:04pm
The concentration of a chemical degrades in water according to order kinetics. the degradation constant is 0.2 day^-1. if the initial concentration is 100.0 mg/L, how many days are required for the concentration to reach 0.14 mg/L?
chemistry - DrBob222, Saturday, January 15, 2011 at 11:20pm
You still didn't post the order. If we assume first order (a guess on my part) then
k = 0.693/t_1/2
k = 0.693/0.2 = ??

ln(No/N) = kt
No = 100.0 mg/L
N =0.14 mg/L
k = from above.
t = unknown
Solve for t in days.

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