Chapter 16, Problem 16.73SP

Water at ${500}^{o}C$ and 250 atm is a supercritical fluid. Under these conditions, $K_w$ is approximately $1.7\times {10}^{-19}.$ Estimate ${\text{[H}}_{\text{3}}{\text{O}}^{\text{+}}\text{]}$ and ${\text{[OH}}^{\text{-}}\text{]}$ at 500 ^oC. Is the water acidic, basic, or neutral?