Stoichiometric coefficients for pH/pOH

[Althea Zhao 1B]

When we calculate the pH or pOH for strong acids and bases, do we need to raise [H3O+] or [OH-] to their stoichiometric coefficients? For example, would the pOH of Ba(OH)2 be -log[OH]^2?

[Christine Honda 2I]

No, you do not need to raise it to the stoichiometric coefficients because when you take the pOH you are taking the -log of the concentration of OH- ions, not the ratio of them.

[gconcha]

No, you don't need to do that because during the process of calculating [H₃O⁺] or [OH^-], you should have already taken the stoichiometric coefficients into account in your ICE chart or K_A / K_B calculation

[Chris Charton 1B]

Raising concentrations to their stoichiometric coefficient is only required for the equilibrium equations.