Titrimetric Analysis: Quantitative Chemical Measurement
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Questions and Answers

What is the term used to describe quantitative chemical analysis that involves determining the volume of a solution of accurately known concentration?

  • Volumetric analysis
  • Quantitative determination
  • Standard solution analysis
  • Titrimetric analysis (correct)
  • What is the solution of accurately known strength called in titrimetric analysis?

  • Titration solution
  • Volumetric solution
  • Standard solution (correct)
  • Quantitative solution
  • What type of reactions involve the combination of hydrogen and hydroxide ions to form water?

  • Neutralization reactions (correct)
  • Oxidation reactions
  • Complex formation reactions
  • Precipitation reactions
  • What is the process of determining the amount of substance A by adding a carefully measured volume of a solution with a known concentration of B?

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

    What type of reactions depend on the combination of ions, other than hydrogen or hydroxide ions, to form a soluble, slightly dissociated ion or compound?

    <p>Complex formation reactions</p> Signup and view all the answers

    What is the term formerly used for quantitative determination, but has now been replaced by titrimetric analysis?

    <p>Volumetric analysis</p> Signup and view all the answers

    What is the term for the ratio [Salt] / [Acid] in the Henderson equation?

    <p>Buffer ratio</p> Signup and view all the answers

    What is the pH of a solution containing equal concentrations of acid and its salt?

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

    What is the effect of a tenfold increase or decrease of the buffer ratio on the pH of the solution?

    <p>It raises or lowers the pH by 1 unit</p> Signup and view all the answers

    What is the purpose of titrating an alkaline solution with a standard solution of an acid?

    <p>To determine the amount of base present</p> Signup and view all the answers

    What is the primary function of a buffer solution?

    <p>To resist changes in pH due to the addition of small amounts of acids or bases</p> Signup and view all the answers

    What is the pH of a buffer solution containing 0.1 M acetic acid and 0.1 M sodium acetate, given pKa = 4.76?

    <p>4.76</p> Signup and view all the answers

    What is the term for the point at which the amount of acid is exactly equivalent chemically to the amount of base present in a titration?

    <p>All of the above</p> Signup and view all the answers

    What happens to the pH of a solution when a strong acid is added to an ammonium hydroxide-ammonium chloride buffer?

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

    What is the role of the salt in a buffer solution containing a weak acid and its salt?

    <p>To reduce the ionization of the weak acid</p> Signup and view all the answers

    What is the conventional manner of writing the dissociation of a weak electrolyte, such as acetic acid, in dilute aqueous solution?

    <p>HCH3COO + H2O → H3O+ + CH3COO-</p> Signup and view all the answers

    What is the equation used to calculate the pH of a buffer solution from a weak acid and its salt?

    <p>pH = pKa + log [A-] / [HA]</p> Signup and view all the answers

    What is the purpose of the Law of Mass Action in the context of acid-base equilibria?

    <p>To determine the dissociation constant of a weak electrolyte</p> Signup and view all the answers

    What is the relationship between the primary and secondary dissociation constants of a diprotic acid?

    <p>K1 is always greater than K2</p> Signup and view all the answers

    What happens to the H+ ions when a strong acid is added to an acetic acid-acetate buffer solution?

    <p>They produce an equivalent amount of the relatively weak acid</p> Signup and view all the answers

    What is the importance of the relative dissociation constants in understanding the behavior of a buffer solution?

    <p>They influence the buffer action of the solution</p> Signup and view all the answers

    What is the effect of increasing the dilution of a diprotic acid on the secondary dissociation?

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

    What is the significance of the magnitude of the ionization constants in the dissociation of a polyprotic acid?

    <p>They measure the extent of ionization at each stage</p> Signup and view all the answers

    What is the term used to describe the equilibrium constant of the dissociation of a weak electrolyte?

    <p>Dissociation constant</p> Signup and view all the answers

    What is the value of pH at the first equivalence point approximately?

    <p>4.6</p> Signup and view all the answers

    Which indicator is suitable for the secondary stage of phosphoric acid?

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

    What is the value of pH at the second equivalence point approximately?

    <p>9.7</p> Signup and view all the answers

    Why is direct titration of orthophosphoric acid as a tribasic acid impossible with any indicator?

    <p>Because K3 is very small</p> Signup and view all the answers

    How can phosphoric acid be titrated indirectly?

    <p>By replacing it with an equivalent amount of HCl</p> Signup and view all the answers

    What is the value of pH at the third equivalence point approximately?

    <p>12.35</p> Signup and view all the answers

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