Multiple Choice
Determine how many grams of sodium acetate, NaCH3CO2 (MW:82.05 g/mol), you would mix into enough 0.065 M acetic acid CH3CO2H (MW:60.05 g/mol) to prepare 3.2 L of a buffer with a pH of 4.58. The Ka is 1.8 x 10-5.
18. Aqueous Equilibrium
Intro to Buffers
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following would produce a buffer?
A
HC2H3O2 / NH3
B
NH3 / NaCl
C
HClO4 / NaOH
D
HF / KF
E
HNO3 / NaNO3
Verified step by step guidance1
Understand what a buffer solution is: A buffer solution is a system that resists changes in pH when small amounts of acid or base are added. It typically consists of a weak acid and its conjugate base, or a weak base and its conjugate acid.
Identify the components of each pair: For each given pair, determine if they consist of a weak acid and its conjugate base or a weak base and its conjugate acid.
Analyze the pair HC2H3O2 / NH3: HC2H3O2 is acetic acid (a weak acid), and NH3 is ammonia (a weak base). This pair does not form a buffer because it does not consist of a weak acid and its conjugate base or a weak base and its conjugate acid.
Analyze the pair NH3 / NaCl: NH3 is a weak base, but NaCl is a salt that does not provide a conjugate acid or base. This pair does not form a buffer.
Analyze the pair HF / KF: HF is a weak acid, and KF is a salt that provides the conjugate base F-. This pair forms a buffer because it consists of a weak acid and its conjugate base.
Related Videos
Related Practice
Intro to Buffers practice set
Problem sets built by lead tutorsExpert video explanations