Apentix/AP Chemistry/Unit 8: Acids and Bases/Question
AP Chemistrymediummcq1 pt

Why does the equivalence point of an HCl titration with NaOH land at pH 7 at 25 °C?

A.Because NaOH donates hydroxide directly to chloride
B.Because Na⁺ and Cl⁻ do not hydrolyze, leaving only water's autoionization to set the pH
C.Because chloride ions release OH⁻ in water
D.Because both reagents being strong pushes the pH above 7

Explanation

Core Concept

Neutralization leaves nothing but NaCl dissolved in water. Na⁺ is the spectator cation of a strong base and Cl⁻ is the conjugate base of a strong acid, so neither reacts with water to generate H₃O⁺ or OH⁻. With no hydrolyzing ion present, the pH rests exactly where pure water sits, at 7.00.

Correct Answer

BBecause Na⁺ and Cl⁻ do not hydrolyze, leaving only water's autoionization to set the pH

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