The Solution:
From the given graph, we have that

We need to find the logarithmic function that describes the situation.

So, the logarithmic function is

To find the value of a, we shall use the initial values:

Thus, the logarithmic function is

Writing the logarithmic function as an exponential function, we get

The pool maintenance man wants to raise the amount of hydronium ions to 0.50 , that is, t=0.50, find the PH level, that is, the value of p.


Therefore, the PH level will be 0.3010.