Discussion
What does a polar stationary phase separate by, beyond volatility?
Answer: A
A polar phase retains hydrogen-bonding and dipolar compounds far more than their boiling points alone would suggest, so elution order departs from volatility. Molecular weight, carbon count and diffusivity are not the mechanism. That changing the phase changes the elution order, while changing the temperature or the length does not, is why selectivity is the lever reached for when two peaks refuse to separate. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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