H3PO4 is dibasic in nature and forms a buffer against:
Correct answer: A. Strong base
- A. Strong base
- B. Strong acid
- C. Weak base
- D. Both strong and weak bases
Explanation
H3PO4 is a dibasic acid, meaning it has two acidic hydrogen atoms that can dissociate in water to form two H+ ions. When H3PO4 is mixed with its conjugate base, H2PO4-, it forms a buffer solution that can resist changes in pH. When H3PO4 is mixed with a strong base, such as NaOH, the strong base reacts with the weak acid (H2PO4 -) to form its conjugate base (PO43- ), which neutralizes the added OH- ions and maintains the pH of the solution.
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