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11 Cards in this Set
- Front
- Back
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Buffer
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A solution that holds the pH constant even if acid or base is added
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Components of a buffer
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Weak acid and its conjugate base
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How does a buffer work?
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Weak acid will neutralize added base.
Also a base can neutralize an acid |
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What happens if Acid or base is added?
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HA+ H2O--- A- +H3O
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Why can't a buffer be made from a strong acid and a stong base?
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Conjugates will be neutral if buffer was made from a strong acid or base
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Buffering Capacity
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How much acid or base you can neutralize before you run out of a buffer
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What determines the buffering capacity?
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Quanity
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Henderson-Hasselbalch equation?
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HA+H2O---A- + H3O
Ka= [A-] [H3O]/ [HA] |
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What is the pH of a buffer related to?
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Rate of [A]/ [HA]
pka |
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Usually to buffer at a given pH you choose...
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an acid with a pka close to the desired pH
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Equilvalence point
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the point where you have used up all the acid
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