# A viral preparation was inactive in a chemical broth. The inactivation process was found to be 1st order in viral concentration. At the beginning of the experiment 2.0% of virus was found to be inactive/min. Evaluate the k for the inactivation process?

##### 1 Answer

The rate constant for the inactivation process is equal to

You know that the inactivation process is first order in viral concentration. Mathematically, you can express this by

So, you start with an initial viral concentration of

Now just plug in this value into the equation shown above

Therefore, the rate constant will be equal to