Twenty vitamin C tablets (total mass = 6.3287 g) were powdered and 0.3231 g were dissolved in dilute sulphuric acid. This solution was then titrated with 0.0992 M ammonium cerium (IV) sulfate and 23.28 mL was required to reach the end-point. Given that ammonium cerium(IV) sulfate reacts with ascorbic acid in a 2:1 ratio, calculate the mass of ascorbic acid (in mg) per average tablet.
In titration analysis, the equivalence point signals the chemical equivalence between reactants (analyte and titrant) in terms of the number of moles. The stoichiometric ratio provides the mole ratio between the analyte and titrant.
Answer and Explanation: 1
Our first step is to calculate the moles of ascorbic acid that reacted based on the ratio with the ammonium cerium (IV) sulfate consumed.
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fromChapter 12 / Lesson 11
Learn about equivalence point and end point in titrations. Examine how to find equivalence points in a variety of ways, and discover the steps to do so.