Question

The hydroxide ion concentration of a solution is 1.0 x 10 –8M. What is the pH of the
solution?

Answer 1

$pOH=-log[OH^-]$
$pOH= -log[10^{-8}]=8 \\ pH+pOH=14 \\ pH=14-pOH=6$

Answer 2

The hydroxide ion concentration is 1x10 -8M and from this the pOH can be calculated.

The pOH is 8.

To know the pH, subtract the pOH value from 14.

In this context, the pH of the solution is 14-pOH=14-8=6.

This suggests low pH and high pOH.

This also suggests that the hydrogen ion concentration is high for the solution indicating that the solution is acidic in nature.