What is the name of the line labelled X in the following chromatogram?

Question

BlackTom AI · Accepted Answer

To tackle this question, we need to identify what the label X corresponds to on a typical chromatogram.
Option a: retention line. In chromatography, there isn’t a standard feature commonly called a 'retention line' that matches a labeled line in many diagrams; retention is usually described by retention factor but not a specific line named as such on the plate. This makes this option unlikely.
Option b: origin. The origin is the starting point where the sample is applied, usually at the bottom or left edge of the plate. It is a defined region, but the line labeled X in many chromatogram diagrams is not the origin line itself; the origin is typically marked as a spot or a starting position, not a moving boundary line.
Option c: water line. A water line could be discussed in some TLC contexts as a reference, but in standard thin-layer chromatography (TLC) or paper chromatography diagrams, you typically don’t refer to a 'water line' as a distinct marker for a moving front; this option is not a common or correct label for the line shown.
Option d: solvent front. The dashed line at the upper boundary of the solvent region or the moving boundary where the solvent front has advanced is a standard feature labeled in many chromatograms. The solvent front marks how far the mobile phase has traveled from the origin and is commonly depicted as a dashed line. Since the question specifies the line labelled X, and in most chromatogram diagrams the X line corresponds to this advancing front, this option aligns with the conventional labeling.
In summary, only the description aligned with a moving boundary of the solvent, i.e., the solvent front, matches common chromatographic labeling conventions, making option d the correct choice.

What is the name of the line labelled X in the following chromatogram?

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What is the name of the line labelled Y in the following chromatogram?

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