Question

What is the pH of a solution where [OH-] = 5.6 × 10-4 M?

Answer 1

The pH value indicates the concentration of H+ ions in the solution. We are given the value of the concentrations of the OH- ions, so we can find the pOH using the following equation:

`pOH=-log\lbrack OH^-\rbrack`

The sum of pH and pOH will always be equal to 14, so we find the pH by clearing it from the following relationship:

`pH+pOH=14`

So, pOH value will be:

`pOH=-log\lbrack5.6*10^(-4)\rbrack=3.3`

The pH will be:

`\begin{gathered} pH=14-pOH \\ pH=14-3.3=10.7 \end{gathered}`

The pH of the solution will be 10.7