Biology / Unit 1 Bio 0161 short lesson, about 20 seconds
Buffers
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The idea
A buffer is a substance that resists a change in a solution's pH by absorbing or releasing hydrogen ions as conditions shift.
In practice
A bicarbonate buffer in lake water absorbs excess hydrogen ions from runoff, keeping the water within a range fish can survive.
Where people slip
A buffer moderates a pH change within a working range; it does not hold pH fixed against every addition.
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