First, we need to know that to calculate pH or pOH we can use the following formulas:
pH = -log[H+]
pOH = -log[OH-]
And, also, pH + pOH = 14
So if we know the pOH of a solution, easily we can know the pH of it.
To solve this question we will:
Step 1 - Calculate the pOH using pOH = -log[OH-]
Step 2 - calculate the pH using pH + pOH = 14
Step 1:
pOH = - log 2.6 x 10^-7
pOH = - log 2.6 + 7
pOH = 6.59
Step 2:
pH + pOH = 14
pH + 6.59 = 14
pH = 14 - 6.59
pH = 7.41
Answer: The pH of this solution is 7.41.