Which of the following is the Henderson-Hasselbalch equation?
Correct answer: B. pH = pKa + Log([Salt]/[Acid])
- A. pH = pKb + Log([Salt]/[Acid])
- B. pH = pKa + Log([Salt]/[Acid])
- C. pH = pKb + Log([Acid]/[Salt])
- D. pH = pKa + Log([Acid]/[Salt])
Explanation
This is the correct form of the Henderson-Hasselbalch equation used for calculating the pH of an acidic buffer. It relates the pH to the pKa of the weak acid and the ratio of the concentrations of the conjugate base (salt) and the acid.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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