Chemistry / Chem 1887 · Atom · ~20 seconds
Buffers: How They Resist pH Change
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A buffer resists pH change because it holds a weak acid and its conjugate base together, so added H3O+ or OH− is consumed by one of the two.
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A buffered solution's pH barely moves when strong acid is added; pure water swings sharply.
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A buffer resists pH change but does not prevent it — enough added acid or base overwhelms it.