Biology / Unit 1 Bio 0157 short lesson, about 20 seconds
Acids
Captions available
The idea
An acid is a substance that increases the concentration of hydrogen ions in a solution, lowering its pH.
In practice
Dissolved carbon dioxide forms carbonic acid in rainwater, increasing its free hydrogen ions and lowering its pH below 7.
Where people slip
An acid is defined by what it adds to a solution's hydrogen ion concentration, not by how it tastes or what it can dissolve.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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