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Why are chromatographic peaks broader than would be expected solely on the basis of the random nature of solute migration through a chromatographic column?

The percent (% w/w) water in a freeze-dried antibiotic is determined in the following manner. A 0.175-g sample is placed in a vial along with 4.489 g of methanol. Water in the sample extracts into the methanol, which is then analyzed. If GC analysis of th...

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