Multiple Choice
What is the initial concentration of formic acid (HCOOH) in the solution before titration?
18. Aqueous Equilibrium
Titrations: Weak Acid-Strong Base
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
During the titration of a weak acid with a strong base, which of the following statements is true regarding the pH at the equivalence point?
A
The pH at the equivalence point depends on the initial concentration of the acid.
B
The pH at the equivalence point is greater than 7.
C
The pH at the equivalence point is less than 7.
D
The pH at the equivalence point is always 7.
Verified step by step guidance1
Understand the concept of equivalence point in a titration: The equivalence point is reached when the amount of titrant added is stoichiometrically equivalent to the amount of substance present in the solution being titrated.
Recognize the nature of the acid and base involved: In this case, a weak acid is being titrated with a strong base. This is important because the nature of the acid and base affects the pH at the equivalence point.
Consider the chemical reaction occurring: When a weak acid reacts with a strong base, the weak acid is neutralized, forming water and the conjugate base of the weak acid.
Analyze the properties of the conjugate base: The conjugate base of a weak acid is typically a weak base, which can slightly increase the pH of the solution above neutral (pH 7) at the equivalence point.
Conclude the pH at the equivalence point: Since the conjugate base of the weak acid can accept protons, the solution becomes slightly basic, resulting in a pH greater than 7 at the equivalence point.
1:30mWatch next
Master Before the Equivalence Point with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Titrations: Weak Acid-Strong Base practice set
Problem sets built by lead tutorsExpert video explanations