The pH of \(1.0 \times 10^{-8} M\) hydrochloric acid is not \(8.00 .\) The correct
\(\mathrm{pH}\) can be calculated by considering the relationship between the
molarities of the three principal ions in the solution \(\left(\mathrm{H}^{+},
\mathrm{Cl}^{-}, \text {and } \mathrm{OH}^{-}\right) .\) These molarities can
be calculated from algebraic equations that can be derived from the
considerations given below.
a. The solution is electrically neutral.
b. The hydrochloric acid can be assumed to be \(100 \%\) ionized.
c. The product of the molarities of the hydronium ions and the hydroxide ions
must equal \(K_{\mathrm{w}}\) Calculate the \(\mathrm{pH}\) of a \(1.0 \times
10^{-8}-M\) HCl solution.