How is the hydronium ion molarity recovered once the pH of a solution is known?

1. The p function is defined as the negative base ten logarithm of a quantity. 2. So pH is minus the logarithm of the hydronium ion molarity. 3. Undoing a logarithm means raising ten to that power. 4. Reversing the sign as well gives the molarity as ten raised to minus the pH. 5. Subtracting from fourteen converts pH to pOH, which is a different quantity. _Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.2 pH and pOH_