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14 Cards in this Set
- Front
- Back
common ion effect
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The shift in equilibrium position that occurs because of the addition of an ion already involved in the equilibrium reaction
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buffered solution
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a solution that resists a change in its pH when either hydroxide ions or protons are added
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Henderson-Hasselbalch equation
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the log form of the acid dissociation equilibrium expression, useful for calculating the pH of solutions when the ration of acid to conjugate base is known
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buffering capacity
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the amount of protons or hydroxide ions the buffer can absorb without a significant change in pH
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pH curve (titration curve)
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the plot of the pH of a solution as a function of the amount of titrant added
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equivalence point (stoichiometric point)
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the point at which enough titrant has been added to react exactly with what is being titrated
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acid-base indicator
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marks the endpoint of a titration by changing color
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phenolphthalein
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a commonly used acid-base indicator
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end point
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point at which the indicator changes color
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effloresce
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to change either throughout or on the surface to a mealy or powdery substance upon exposure to air, as a crystalline substance through loss of water of crystallization.
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effervesce
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to give off bubbles of gas
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hygroscopy
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the ability of a substance to attract and hold water molecules from the surrounding environment
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hydrophobe
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physical property of a molecule that is repelled from water
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hydrophile
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physical property of a molecule that is attracted to water
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