pH and pOH Formulas
pH = -log[H3O+]
pOH = -log[OH−]
pH + pOH = 14.00

Concentration Formulas
[H3O+] = 10-pH
[OH−] = 10-pOH
[H3O+][OH−] = 1.0 × 10-14

Round your answer to the nearest hundredth
A solution has a hydronium concentration of 4.7 × 10-11. What is the pH of the solution?