Chemistry

Problem

A data table lists

K_w = 6.6 \times 10^{-15}

10^\circ\text{C}

and

K_w = 1.0 \times 10^{-14}

25^\circ\text{C}

. Assuming that

\log_{10} K_w

changes linearly with temperature over this interval, estimate the pH of neutral water at

18^\circ\text{C}