Henderson-Hasselbalch equation is used to calculate the pH of a buffer solutions. The correct representation of the equation is:
Correct answer: C. pH = pKa + log([Salt]/[Acid])
- A. pH = pKa + log([Acid]/[Salt])
- B. pH = pKa - log([Salt]/[Acid])
- C. pH = pKa + log([Salt]/[Acid])
- D. pH = pKa - log([Acid]/[Salt])
Explanation
Henderson-Hasselbalch equation to calculate the pH of a buffer solution ispH=pka+log[salt]/[Acid]
This question appeared on the ETEA MDCAT 2018 paper, which you can sit online with every answer explained.
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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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