## Chemistry: Molecular Approach (4th Edition)

The hydronium ion concentration of a solution with pH = 8.37 is equal to: $$4.3 \times 10^{-9} \space M$$
Using the equation for $[H_3O^+]$ based on pH: $$[H_3O^+] = 10^{-pH} = 10^{-8.37} = 4.3 \times 10^{-9} \space M$$