THE SYSTEM NAPHTHALENE–p-NITROPHENOL: AN EXPERIMENTAL INVESTIGATION OF ALL THE VARIABLES IN AN EQUATION OF THE FREEZING POINT CURVE

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Abstract
With the object of determining the factors responsible for the inapplicability of the ideal equation of the freezing curve,[Formula: see text]a number of experimental determinations have been carried out on the system naphthalene–p-nitrophenol. These were: (i) specific heat, (ii) heat of fusion, (iii) heat of mixing, (iv) vapour pressure, (v) vapour composition, (vi) density, (vii) surface tension, (viii) viscosity.The conclusion is arrived at that the discrepancy is due principally to the invalidity of Raoult's law in this case. Since the deviation is positive with respect to both components, it cannot be ascribed to compound formation in solution. Apart from the deviation from Raoult's law, the solution does not exhibit marked abnormality.The data obtained also permit of the complete, or almost complete, construction of the p–t–x model for this system.

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