Discussion
Why does reversed phase dominate liquid chromatography?
Answer: B
Pharmaceuticals, peptides and environmental analytes are mostly polar and water-soluble, and water-organic eluents dissolve them, run reproducibly and suit mass spectrometric detection. Column cost, efficiency and pressure are comparable across modes. That a mode won because its solvents happened to suit the samples people actually had, rather than for any theoretical superiority, is the honest explanation. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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