Self-ionization of water - Autoionization of water - The ion product of water (kw)
Self-ionization of water - Autoionization of water - The ion product of water (kw) Home > Weak Acids and Bases – Calculate the pH of a weak acid (a general equation) > Solving Weak Acid and Weak Base pH problems > Weak Acid Weak Base pH calculation solved example > Weak Acid Weak Base pH calculation solved example > Cubic Equation Calculator for Weak Acid-Base Equilibria > Polyprotic Acids / pH Calculation > Self-ionization of water - Autoionization of water - The ion product of water (kw) Self-ionization of water - Autoionization of water - The ion product of water (kw) A water molecule can act as an acid and as a base according to: In the above reaction – autoionization of water - one water molecule acts as an acid donating a proton to the other water molecule that acts as a base – proton acceptor. From the equation we see that for every hydronium ion H 3 O + that is formed a hydroxyl ion