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Which buffer resists changes in pH most effectively?

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A buffer is most effective when \[ \boxed{\mathrm{pH}=\mathrm{p}K_a.} \] The buffering range is approximately \[ \boxed{\mathrm{p}K_a\pm1.} \]

Updated On: Jul 14, 2026

\(\mathrm{pH}=2,\; \mathrm{p}K_a=2\)
\(\mathrm{pH}=4,\; \mathrm{p}K_a=5\)
\(\mathrm{pH}=7,\; \mathrm{p}K_a=3\)
\(\mathrm{pH}=9,\; \mathrm{p}K_a=5\)

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The Correct Option is A

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