What is an acid?
What is a base?
These are both good questions and there is no simple answer.
It all depends on how you decide to define the terms "acid" and "base".
More than 100 years ago, a clever chemist by the name of Arrhenius proposed the first really useful definitions of acids and bases and AUS-e-TUTE has just added a new tutorial, game, test and exam (with worked solutions!), and even some flash cards o help you understand and apply the Arrhenius definition of an acid and of a base.
Not an AUS-e-TUTE Member? You can go to a free-to-view tutorial at
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