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Q: Based on Henderson-Hasselbalch equation, at what pH value a weak acid would be 99.9% ionized?
  • A. At pH equivalent to pka +3
  • B. At what pH equivalent to Pka - 3
  • C. At pH equivalent to pka - 1
  • D. At pH equivalent to pka +1
Correct Answer: Option A - The Henderson-Hasselbalch equation is used to determine the pH of a buffer system. In this equation Ka is the acid dissociation constant, and pKa is the negative log of Ka. According to this equation at the pH value. (equivalent to pKa + 3) the weak acid would be ionized to 99.9%.
A. The Henderson-Hasselbalch equation is used to determine the pH of a buffer system. In this equation Ka is the acid dissociation constant, and pKa is the negative log of Ka. According to this equation at the pH value. (equivalent to pKa + 3) the weak acid would be ionized to 99.9%.

Explanations:

The Henderson-Hasselbalch equation is used to determine the pH of a buffer system. In this equation Ka is the acid dissociation constant, and pKa is the negative log of Ka. According to this equation at the pH value. (equivalent to pKa + 3) the weak acid would be ionized to 99.9%.