Chemistry

Problem

A laboratory technician prepares four aqueous mixtures at 25 °C, each by combining the stated volumes of 0.10 M acetic acid, HC₂H₃O₂, and 0.10 M NaOH. In which mixture will the resulting solution best resist changes in pH when a small amount of strong acid or base is added? I. 25 mL HC₂H₃O₂ + 25 mL NaOH II. 50 mL HC₂H₃O₂ + 25 mL NaOH III. 25 mL HC₂H₃O₂ + 50 mL NaOH IV. 75 mL HC₂H₃O₂ + 75 mL NaOH a)

I \text{ only}

IV \text{ only}

II \text{ only}

I \text{ and } II

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