Practice question · Select all that apply
Which are true of an effective buffer solution?
Hints
- Three describe how buffers work; one overstates what they can do.
- Capacity is finite and set by how much of each component is present.
Show the answer
- A. It contains a weak acid and its conjugate base in comparable amounts
- B. Its pH is close to the pKa of the weak acid
- C. Its pH is almost unchanged by moderate dilution
Why
A buffer needs both partners in comparable amounts, works best near the , and survives dilution because only the ratio matters. Its capacity is strictly finite, and once exhausted the pH moves abruptly.
Practise Buffers, Hydrolysis and Titration
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