Ch 15 – Chemistry Answers – Flashcards
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| amphoteric |
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| exhibiting both acidic and basic properties |
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| buffer capacity |
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| a measure of the amount of acid or base that a buffer can absorb without a significant change in pH |
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| buffer solution |
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| a solution of a weak acid and its conjugate base that resists drastic changes in pH |
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| common-ion effect |
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| the shift in the position of an equilibrium on addition of a substance that provides an ion in common with one of the ions already involved in the equilibrium |
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| conjugate base |
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| the species A- formed by the loss of H+ from an acid HA |
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| equivalence point |
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| the point in a titration at which stoichiometrically equivalent quantities of reactants have been mixed together |
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| formation constant (Kf) |
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| the equilibrium constant for formation of a complex ion |
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| Henderson-Hasselbalch equation |
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| an equation relating the pH of a solution to the pKa of the weak acid; pH=pKa + log([base]/[acid]) |
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| ion product (IP) |
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| a number defined in the same way as Ksp, except that the concentrations in the expression for IP are not necessarily equilibrium values |
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| pH titration curve |
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| a plot of pH of a solution as a function of the volume of added base or acid |
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| pKa |
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| qualitative analysis |
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| a procedure for identifying the ions present in an unknown solution |
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| solubility product constant (Ksp) |
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| the equilibrium constant for a dissolution reaction |
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| stability constant |
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| weak acid |
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| an acid that dissociates incompletely in water and is a weak electrolyte |
