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8 Cards in this Set
- Front
- Back
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Common-ion effect |
the dissociation of a weak acid or weak base is repressed by the presence of a strong electrolyte that provides an ion common to the equilibrium. |
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Buffered Solutions or Buffers |
Are weak conjugate acid-base pairs. |
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The addition of small amounts of a strong acid or base to a buffered solution causes |
only a small changes to the pH. |
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Strong acid and base, strong acid weak base and weak acid strong base reactions with buffers proceed |
Essentially to completion. |
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Two important characteristics of a buffered solution are |
its buffer capacity and its pH. |
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The relationship between pH, pKa, and the concentrations of an acid and its conjugate base can be expressed by |
The Henderson-Hasselbalch equation: pH=pKa + log([base]/[acid]) |
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pH titulation curve of a strong acid-strong base titration exhibits |
A large change in pH in the immediate vicinity of the equivalence point in which the pH is 7. |
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For strong acid weak base or vice versa the pH change . |
is not as large. Furthermore its equivalence point is not pH 7 in either of these cases. Rather it is the pH of the salt solution that results from neutralization |
