If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Autoionization of water into hydronium and hydroxide ions
Bronsted-Lowry definition of acids and bases. Conjugate acids and bases.
Arrhenius definition of acids and bases
Introduction to definition of pH
Arrhenius, Bronsted Lowry, and Lewis Acids and Bases.
Calculating the pH or pOH of strong acids and bases.
Buffer systems to regulate pH in blood