Effect of Sodium Acetate and Sodium Formate on Acid-Base Equilibria
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Questions and Answers

Which pair of substances forms a buffered aqueous solution?

  • H3PO4 and NaH2PO4 (correct)
  • H2SO4 and CH3COOH
  • HNO3 and NaNO3
  • HCl and NaCl
  • What is the purpose of the Henderson-Hasselbalch equation?

  • To calculate the pH of a strong acid solution
  • To calculate the pH of a buffered solution (correct)
  • To calculate the pH of a strong base solution
  • To calculate the pH of a weak acid solution
  • What is the name of the effect that occurs when a compound containing an ion in common with a dissolved substance is added to a solution at equilibrium?

  • Common ion effect (correct)
  • Equilibrium shift
  • Ion adduct
  • Shift ion
  • What is the pH of a solution prepared by mixing 500 mL of 0.10 M NaOCl and 500 mL of 0.20 M HOCl?

    <p>7.19</p> Signup and view all the answers

    Which of the following is the conjugate acid of NH3?

    <p>NH4+</p> Signup and view all the answers

    Which of the following is the best choice for preparing a buffer with a pH of 3.5?

    <p>C6H4(COOH)2, Ka = 2.9 × 10–4</p> Signup and view all the answers

    What happens to the pH of a solution when sodium acetate is added to a solution of acetic acid?

    <p>The pH increases</p> Signup and view all the answers

    In a buffer solution, which component/resists the change in pH when small amounts of acid or base are added?

    <p>The conjugate acid</p> Signup and view all the answers

    What happens to the percentage of ionization when a strong acid is added to a weak acid?

    <p>The percentage of ionization decreases</p> Signup and view all the answers

    What effect does dilution have on a buffer solution's ability to resist changes in pH?

    <p>Dilution weakens the buffer's ability</p> Signup and view all the answers

    If a strong base is added to a buffered solution, what will happen to the pH of the solution?

    <p>The pH remains the same</p> Signup and view all the answers

    What is the consequence of having a buffer solution where the concentrations of the weak acid and its conjugate base are equal?

    <p>The buffer solution becomes ineffective</p> Signup and view all the answers

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