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Questions asked by users might not always be phrased in the clearest way.
A good NMR reference standard should be:
Chemically inert: It shouldn't react with the sample or the solvent.
Soluble in the solvent used: Ensures proper signal detection.
Well-defined and narrow signal: Provides an accurate reference point.
Known chemical shift: Allows for precise calibration.
Stable over time: Ensures consistent measurements.
Non-toxic: Important for safety.