The catalytic function of most enzymes is a sensitive function of pH. The attached plot (activity vs pH) of the data will clearly illustrate the degree of this sensitivity. What is the optimum pH for this enzyme?
An enzyme works best under a specific range of conditions. Factors like concentration, temperature ...
This solution describes how to determine an optimal pH from an enzyme given a range of activity. The question provides some data about the enzymatic activity over a range of pH.