객관식
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.
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18. Aqueous Equilibrium
Intro to Buffers
객관식
Which of the following would produce a buffer?
A
HC2H3O2 / NH3
B
NH3 / NaCl
C
HClO4 / NaOH
D
HF / KF
E
HNO3 / NaNO3
검증된 단계별 안내1
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.
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