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Buffer Solutions

Buffer solutions are those which resist a change in pH upon addition of small amount of acid or base. This does not mean that the pH will not change, and all it means is that the pH change would be less than the change that would have occurred had it not been a buffer.
It should be clearly understood that the reason a buffer is able to resist change in pH is because on adding H+, the solution consumes it to produce a weak acid and on adding OH–, the solution produces a weak base. Moreover, since the produced weak acid of weak base gives lesser amounts of H+ or OH– ions than from which they were produced, it eventually leads to a small pH change.
Acidic buffer: Description: 22153.png
Basic buffer: Description: 22164.png

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