The measurement pH determines if an aqueous solution is acidic or basic. It can be calculated by with the concentration of hydronium ions in the solution. Another measurement is the pOH of a solution which can be calculated using the hydroxide concentration of the solution. Determining either value will let you get the other because pH and pOH add up to 14 at room temperature. Since weak acids and bases only partially dissociate in a solution, the equilibrium equation for the reaction will be used to determine how much they dissociate.
Helpful Links:
https://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/Calculating_pHandpOH.htm
http://www.chemteam.info/AcidBase/Ka-Solving1.html
http://www.chemguide.co.uk/physical/acidbaseeqia/acids.html
http://chemwiki.ucdavis.edu/Physical_Chemistry/Acids_and_Bases/Aqueous_Solutions/The_pH_Scale/Determining_and_Calculating_pH
Appreciate the links Peter! It is also good to remember that 14 is the magic number when it comes to pH and pOH.
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