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Change in pH is resisted by a buffer on addition of small amount of acid or base.
When a small amount of a strong acid or base is introduced to a buffer, the change in pH does not occur. This is accurate provided that the quantity of strong acid or base supplied does not significantly outweigh the quantity of conjugate base and conjugate acid already in the buffer. The buffering capacity will exceed if an excessive amount of a strong acid or basic is added.
A buffer is a substance that can withstand a change in pH when acidic or basic substances are added. Small additions of acid or base can be neutralized by it, keeping the pH of the solution largely constant. For reactions that call for certain and stable pH ranges, this is significant. The pH range and capacity of buffer solutions determine how much acid or base can be neutralized before there is a change in pH and how much pH will vary.
A buffer is a unique liquid that prevents significant pH level fluctuations. Each buffer that is created has a specific buffer range and buffer capacity. The quantity of base or acid that may be added to a buffer before the pH starts to noticeably shift is known as the buffer capacity.
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