For a buffer to continue to work effectively, the pH of a buffer has to be close to the pK_aof the conjugate acid.

Name: For a buffer to continue to work effectively, the pH of a buffer has to be close to the pK a of the conjugate acid.
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A buffer works most effectively when the pH is close to the pKa of its conjugate acid because this ensures that both the acid and its conjugate base are present in significant amounts, allowing the buffer to neutralize added acids or bases.

For a Buffer to Continue to Work Effectively, the PH