# A swimming pool worker wants the pool's pH to be 7.2. She comes by to test the water and finds that the pH is 6.2. What should she do to correct this situation?

I think the typical pool chemical for this sort of $p H$ adjustment is sodium carbonate.
$C {O}_{3}^{2 -} + {H}^{+} \rightarrow H C {O}_{3}^{-}$
Since $\left[{H}^{+}\right]$ is being reduced, $p H$ should increase.