In this experiment, how do we measure the amount of electrons donated by vitamin C?

Question

BlackTom AI · Accepted Answer

Question restatement: The prompt asks, 'In this experiment, how do we measure the amount of electrons donated by vitamin C?' The provided answer option is: 'Titrate the donated electrons and look for color change.'

Assessment of the single option: The idea of measuring electron donation via titration aligns with the general concept of redox titration, where a reducing agent (like vitamin C) donates electrons to an oxidizing titrant (such as iodine or a dye like DCPIP). In practice, what is measured is the extent of the redox reaction, which is often tracked by a color change in the indicator dye or by an endpoint in the titration. Saying we 'titrate the donated electrons' is a shorthand; electrons themselves aren’t titrated directly, but the redox reaction and the corresponding colorimetric endpoint quantify how many electrons were donated.

However, there are some caveats:
- The phrasing is somewhat awkward because electrons are not a titrant; rather, the amount of electron donation is inferred from the amount of oxidant reduced during the titration.
- The method typically relies on a specific redox indicator or reagent (e.g., iodine, DCPIP) that changes color when it is reduced, signaling the endpoint and allowing calculation of the vitamin C content based on stoichiometry.
- The statement does not specify which titrant is used, nor does it mention the need to calibrate against a standard or to account for side reactions, which are important in accurate measurements.

Why this could be considered acceptable in a general sense:
- It captures the core concept that vitamin C acts as a reducing agent and that the experiment uses a titration with a color-change endpoint to quantify the amount of reducing power (i.e., the electrons donated).
- The color change at the endpoint is a common and essential feature of many vitamin C titration protocols.

Why this might be seen as incomplete or imperfect:
- It lacks specificity about the titrant and the exact redox chemistry (for example, iodine or DCPIP as the oxidizing agent) used to gauge electron donation.
- It does not mention stoichiometric calculations or how the endpoint translates into a numeric value for electrons donated or vitamin C concentration.

In summary, the option reflects the general approach of using a redox titration with a color-change indicator to measure the reducing power of vitamin C, i.e., the electrons donated. Yet, the wording could be improved to avoid the notion of titrating electrons directly and to specify the titrant and the quantitative steps involved for a complete, precise description.

CHM111L A Lab 5 Pre-Lab Quiz

In this experiment, how do we measure the amount of electrons donated by vitamin C?

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