Titration: ½ Equivalence Point and Weak Base-Strong Acid Titrations
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Questions and Answers

At the equivalence point of a weak base/strong acid titration, what is the pH of the solution?

  • 9.26 (correct)
  • 10.00
  • 7.00
  • 4.74

What is the pOH at the halfway point of a weak base/strong acid titration?

  • 9.26
  • 4.74 (correct)
  • 6.00
  • 2.37

In a weak acid/strong base titration, what is the pH at the equivalence point?

  • 7.00 (correct)
  • 10.00
  • 9.26
  • 4.74

What happens to the pH of a weak acid solution when NH4+ ions are added?

<p>pH decreases (D)</p> Signup and view all the answers

In a weak base/strong acid titration, what is the concentration of NH3 at the equivalence point?

<p>0 mol/L (A)</p> Signup and view all the answers

At the halfway point of a weak acid/strong base titration, what is the pOH of the solution?

<p>4.74 (B)</p> Signup and view all the answers

What is the equilibrium concentration of NH4+ in the given reaction?

<p>8.5×10^-4 M (D)</p> Signup and view all the answers

What is the pOH of the solution?

<p>3.07 (A)</p> Signup and view all the answers

What is the pH of a 0.020-M solution of NH3 at 25°C?

<p>-10.93 (B)</p> Signup and view all the answers

What common error do students often make in Kb problems?

<p>Mistaking x for hydronium ion concentration instead of hydroxide ion concentration (C)</p> Signup and view all the answers

What does it mean for a solution to have a basic pH?

<p>The pH is greater than 7 (A)</p> Signup and view all the answers

What factor influences solubility in complex ion formation?

<p>pH (B)</p> Signup and view all the answers

What is the pH at the equivalence point of a weak base/strong acid titration involving 25.00 mL of 0.100 M NH3 solution?

<p>1.78 (A)</p> Signup and view all the answers

If the concentration of NH4Cl formed after adding 35.00 mL of 0.100 M HCl at the equivalence point is 1.00×10^(-3) mol, what is the initial concentration of NH3 in the flask?

<p>0.125 M (C)</p> Signup and view all the answers

In a weak acid/strong base titration, what is the pH after the equivalence point if it was 12.22 before the equivalence point?

<p>7.00 (A)</p> Signup and view all the answers

How do you determine that you are past the equivalence point in a titration involving a weak base and a strong acid?

<p>Mol of strong acid &gt; Mol of weak base (A)</p> Signup and view all the answers

What is the effect of adding 35.00 mL of 0.100 M HCl after the equivalence point in a weak base/strong acid titration?

<p>[H+] decreases significantly (D)</p> Signup and view all the answers

Which pH value represents the equivalence point in a titration involving a weak acid and a strong base?

<p>8.72 (B)</p> Signup and view all the answers

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