FSU
CHM 1046 -
Buffer Effectiveness
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16 3 Buffer Effectiveness Buffer effectiveness depends on two factors 1 The base conc acid conc ratio should be within the range of 0 10 to 10 2 A buffer with a greater amount of acid and conjugate base is more resistant to pH changes and is more effective Dilution makes buffers less effective This is because diluting a solution diminishes the concentration of acid and base and decreases their ability to neutralize BUFFER RANGE The pH of an effective buffer should be within or 1 of the pKa pH pKa 1 This is the lowest pH for an effective buffer pH pKa 1 This is the highest pH for an effective buffer BUFFER CAPACITY the amount of acid or base that can be added to a buffer with out destroying it s ability to maintain a constant pH
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