Given that the concentration of H3O+ is 1.0 x 10^-7 M in pure water, calculate the equilibrium constant (Kw) for the autoionization of water.

• A. 1.0 x 10^-14
• B. 1.0 x 10^-21
• C. 1.0 x 10^-7
• D. 1.0 x 10^-10

Answer: (A)