When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?
Correct answer: A. 0.115
- A. 0.115
- B. 0.900
- C. 0.015
- D. 0.215
Explanation
Buffer capacity can be estimated as the amount of strong base added per unit change in pH: β = 0.010 mol / (4.832 - 4.745) = 0.010 mol / 0.087 = 0.115 mol pH-1. Students may choose c by using the final pH or the pH change alone, but buffer capacity requires dividing the added amount by the pH change.
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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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