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

Practice Questions

Q1
In a weak acid-strong base titration, what is the pH at the equivalence point?
  1. Less than 7
  2. Equal to 7
  3. Greater than 7
  4. Cannot be determined

Questions & Step-by-Step Solutions

In a weak acid-strong base titration, what is the pH at the equivalence point?
Correct Answer: pH > 7
  • Step 1: Understand that a titration involves mixing an acid with a base.
  • Step 2: Identify that in this case, we have a weak acid and a strong base.
  • Step 3: Know that at the equivalence point, all the weak acid has reacted with the strong base.
  • Step 4: Recognize that this reaction produces a weak conjugate base from the weak acid.
  • Step 5: Remember that weak conjugate bases can accept protons (H+) from water, which increases the concentration of hydroxide ions (OH-).
  • Step 6: Conclude that because of the presence of the weak conjugate base, the solution will be basic.
  • Step 7: Therefore, the pH at the equivalence point will be greater than 7.
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