AP Chemistry
4.6 Introduction to Titration
4.5 Stoichiometry
A student uses a volumetric pipet to transfer a \(25.00\text{ mL}\) sample of an unknown monoprotic acid, \(\text{HA(aq)}\), into a flask. The student titrates the sample with standardized \(0.1000\text{ M}\) \(\text{NaOH(aq)}\), using phenolphthalein as the indicator. The neutralization reaction has a \(1:1\) mole ratio.
Near the endpoint, the student adds too much titrant, producing a persistent deep-pink solution rather than the first persistent pale-pink color. The student records \(28.64\text{ mL}\) as the volume of titrant delivered and uses this volume to calculate the initial concentration of the acid. All other measurements are made correctly.
Which statement correctly describes how the error affects the calculated concentration of \(\text{HA(aq)}\)?
Near the endpoint, the student adds too much titrant, producing a persistent deep-pink solution rather than the first persistent pale-pink color. The student records \(28.64\text{ mL}\) as the volume of titrant delivered and uses this volume to calculate the initial concentration of the acid. All other measurements are made correctly.
Which statement correctly describes how the error affects the calculated concentration of \(\text{HA(aq)}\)?
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