In a titration of 25.0 mL of 0.10 M HCl with 0.10 M NaOH, what is the pH of the solution at the equivalence point at 25°C?
Answer and explanation
Correct answer: C. 7.0
- Step 1: Analyze the nature of the reactants: strong acid (HCl) neutralized by a strong base (NaOH).
- Step 2: At equivalence, all acid and base are converted to aqueous NaCl and H₂O. Neither Na⁺ nor Cl⁻ hydrolyzes, so the solution remains neutral with at 25°C.
Answer
7.0.
Why not the others: 1.0 is before titration begins; 4.0 occurs in weak base - strong acid titrations; 10.0 occurs in weak acid - strong base titrations.
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