Abstract
The ternary phase diagram for the partially miscible liquid system n-propanol-n-heptane-water can be determined readily in an undergraduate laboratory experiment. The coexistence curve is obtained from titration results. Tie lines are then estimated from the compositions of pairs of phases in equilibrium, the propanol concentrations being determined by gas chromatography. The reagents are less hazardous than those of the classic acetic acid-chloroform-water system, and the gas chromatographic analysis has more interest for students than the acid-base titrations of the older experiment.
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