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- pH changes very little even with the
- gradual addition of a large amount of titrant.
- A buffer is a substance that maintains
- the pH of a solution when a small amount of
- acid or base is added. Buffers are composed
- of a solution of a weak acid and its salt
- (or a weak base and its salt). For example,
- a buffer solution of hypoiodous acid (a
- weak acid) exists in the following
- equilibrium:
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