Determining pKa of a Weak Acid

• Equals to pH at the half-tration point (with a strong base)

• So, steps are:

  • Locate the half-titration point
  • Draw a vertical line at the half-titration point to determine the point h where it cuts the titration curve
  • Draw a horizontal line passing through h
  • pKa equals the pH at which the horizontal line meets the y-axis

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