Topic 8.7: pH and pKa - Analyzing Titration Curves

The titration curve shown represents the addition of what to what?

• Strong acid to strong base

• Weak acid to strong base

• Strong base to weak acid

• Strong base to strong acid

What does the inflection point on the titration curve for a strong base added to a weak acid represent?

• The initial pH of the weak acid

• The halfway point to equivalence

• The equivalence point

• The point where the solution becomes a buffer

At the halfway point to the equivalence point in a weak acid-strong base titration, what is the relationship between the concentration of the weak acid (HA) and its conjugate base (A-)?

• [HA] > [A-]

• [HA] < [A-]

• [HA] = [A-]

• [HA] is approximately zero

In a weak acid-strong base titration, what species predominates in the solution before the halfway point?

• The weak acid (HA)

• The conjugate base (A-)

• Hydroxide ions (OH-)

• Water (H2O)

What species predominates in the solution after the equivalence point in a strong base added to a weak acid titration?

• Weak acid (HA)

• Conjugate base (A-)

• Hydroxide ions (OH-)

• Hydronium ions (H3O+)

Which of the following indicators would be the best choice for a titration of a weak acid with a strong base?

• Litmus (pKa 7.0)

• Methyl orange (pKa 3.4)

• Phenolphthalein (pKa 9.4)

• Bromothymol blue (pKa 6.0)