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9 Cards in this Set
- Front
- Back
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Define the common-ions effect.
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The extent of ionization of a weak acid electrolyte is decreased when a strong electrolyte is added that has an ion in common with the weak electrolyte.
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What is a buffer ?
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A solution that contains a weak acid-base conjugate pair that can resist drastic changes to pH.
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Why does a buffer solution resist changes in pH ?
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It contains both an acid to neutralize hydroxide ions and a base to neutralize hydronium ions.
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How would you prepare a buffer solution ?
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Have a weak acid-base conjugate pair and add a salt that contains a common ion of that pair.
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How would you calculate the pH of a buffer solution ?
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pH = pKa + (log x [base]/[acid])
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What is the pH of a buffer that is 0.12 M in lactic acid, HC3H5O3, and 0.10 M in sodium lactate?
Ka for lactic acid is 1.4 x 10−4. |
pH = 3,77.
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A buffer is made by adding 0.300 mol HC2H3O2 and 0.300 mol NaC2H3O2 to enough water to make 1.00 L of solution. The pH of the buffer is 4.74. Calculate the pH of this solution after 0.020 mol of NaOH is added.
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pH = 4,80.
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Which three factors influence the solubility of a substance?
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1. Presence of a common ion
2. pH 3. Presence of complexing agents |
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If a solution's substances contains a basic anion, what will happen to the solubility if an acid is added ?
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It will become more soluble.
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