The pOH of a solution is 2.3, what is the hydroxide ion concentration?

To find the hydroxide ion concentration from the pOH value, you can use the formula:

\[POH = -log[OH^-]\]

First, convert the pOH value to OH- concentration:

\[2.3 = -log[OH^-]\]
\[10^{-2.3} = [OH^-]\]

\[ [OH^-] = 0.005 \,M\]

Therefore, the hydroxide ion concentration of the solution is 0.005 M.