In the continuous titration of of with , distinct intermediate buffer regions and equivalence points are established. Which of the following correctly represent the primary species determining the pH

Question

In the continuous titration of $100 	ext{ mL}$ of $0.1 	ext{ M } H_3PO_4$ with $0.1 	ext{ M } NaOH$, distinct intermediate buffer regions and equivalence points are established. Which of the following correctly represent the primary species determining the pH during the specific stages?

Prashant Kotian · Accepted Answer

Correct answer: A,B,D. The titration of triprotic proceeds in three steps. Step 1 buffer is . At Equivalence 1, forms, and its amphiprotic anion determines pH via . During the second step, the buffer is , so at half-neutralization of the second proton, , not . Step 3 creates an buffer.

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