How does a buffer resist change in ph upon addition of a strong acid?

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30-01-2017
Chemistry

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How does a buffer resist change in ph upon addition of a strong acid?

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MoSikder MoSikder · Answer 1 · 2017-02-02T01:31:09+01:00

Any buffer exists in this equilibrium

HA <=> [tex]H^+ + A^-[/tex]
In a buffer, there is a large reservoir of both the undissociated acid (HA) and its conjugate base ([tex]A^-[/tex])

When a strong acid is added, it reacts with the large reservoir of the conjugate base ([tex]A^-[/tex]) forming a salt and water. Since this large reservoir of the conjugate base is used, the ph does not alter drastically, but instead resist the pH change.