Which one of the following is a buffer solution ?
Correct answer: B. blood
- A. brine
- B. blood
- C. glue
- D. solution of CuSO4
Explanation
Blood contains the carbonic acid-hydrogen carbonate buffer system, which helps maintain blood pH despite small additions of acid or base. Brine, glue, and ordinary CuSO4 solution do not normally contain a suitable conjugate acid-base pair for this buffering action. The likely trap is CuSO4 because it is an electrolyte, but conducting electricity does not make a solution a buffer.
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About Buffer Solutions
Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
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