객관식
Which of the following represents the complete ionic equation for the reaction that occurs when a few drops of nitric acid (HNO3) are added to a buffer solution containing acetic acid (CH3COOH) and sodium acetate (CH3COONa)?
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18. Aqueous Equilibrium
Intro to Buffers
객관식
Which of the following statements is true about buffer solutions?
A
A buffer solution is most effective when the concentrations of the weak acid and its conjugate base are very different (for example, a ratio of 100:1).
B
A buffer solution contains significant amounts of a weak acid and its conjugate base (or a weak base and its conjugate acid), allowing it to resist changes in pH when small amounts of acid or base are added.
C
A buffer solution maintains a constant pH even when large amounts of strong acid or strong base are added.
D
A buffer solution must be prepared using only strong acids and strong bases in equal concentrations.
검증된 단계별 안내1
Understand what a buffer solution is: it is a solution that contains a weak acid and its conjugate base (or a weak base and its conjugate acid) in significant amounts.
Recognize that the purpose of a buffer is to resist changes in pH when small amounts of strong acid or base are added, by neutralizing these additions through equilibrium reactions.
Recall that the effectiveness of a buffer depends on having comparable concentrations of the weak acid and its conjugate base, typically within a ratio close to 1:1, not very different like 100:1.
Know that buffers do not maintain a perfectly constant pH when large amounts of strong acid or base are added; their capacity is limited.
Understand that buffers cannot be made from strong acids and strong bases because these completely dissociate and do not establish the equilibrium necessary for buffering action.
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