Autoionization
Definition
Autoionization is the process by which molecules of a pure substance react with each other to form ions. A common example is the autoionization of water, where two water molecules produce hydronium and hydroxide ions.
5 Must Know Facts For Your Next Test
- Autoionization involves the self-ionization of identical molecules.
- In water, autoionization produces equal concentrations of $H_3O^+$ and $OH^-$ ions.
- The equilibrium constant for the autoionization of water is denoted as $K_w$.
- $K_w$ at 25°C is $1.0 \times 10^{-14}$.
- Autoionization can affect pH calculations in solutions, particularly in very dilute acid or base solutions.
Review Questions
- What ions are produced during the autoionization of water?
- How does temperature affect the value of $K_w$?
- Why is autoionization important in pH calculations?
"Autoionization" appears in:
Study guides (1)
Related terms
Equilibrium Constant: A number that expresses the ratio of products to reactants at equilibrium for a reversible reaction.
$pH$: A measure of the hydrogen ion concentration; a measure of the acidity or alkalinity of a solution.
$K_w$: The ion-product constant for water at a given temperature, representing the product of hydronium and hydroxide ion concentrations.
