The following graph represents the titration curve for a diprotic acid using a standardized solution of NaOH. Which of the following statements is correct?
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A diprotic acid (H₂A) has two equivalence points in its titration with NaOH. The graph shows two distinct equivalence points (steep pH rises). Point A is the first equivalence point where H₂A is converted to HA⁻. Point B is the second equivalence point where HA⁻ is converted to A²⁻. The volume of NaOH at point A is for the first equivalence. The pH at point D is not an endpoint; it is likely the starting pH. The volume at B is the total NaOH for both protons, not half of the second equivalent point.
Final Answer: The volume at A represents the volume of NaOH required for the first equivalence point.