. Physical chemistry of vital phenomena, for students and investigators in the biological and medical sciences. Biochemistry; Chemistry, Physical and theoretical. 3o PHYSICAL CHEMISTRY. Fig. 6. Graph indicating the method of integrating the formula PV=RT (from MRR). ume in liters in which i mol solute is contained, R = , and T is the absolute temperature, in which zero is — on the centigrade scale (Fig. 6). Since the volume is the reciprocal of p the concentration, the formula becomes — = T, where c c is the molecular (molar) concentration. If the concentration is 1 and th
. Physical chemistry of vital phenomena, for students and investigators in the biological and medical sciences. Biochemistry; Chemistry, Physical and theoretical. 3o PHYSICAL CHEMISTRY. Fig. 6. Graph indicating the method of integrating the formula PV=RT (from MRR). ume in liters in which i mol solute is contained, R = , and T is the absolute temperature, in which zero is — on the centigrade scale (Fig. 6). Since the volume is the reciprocal of p the concentration, the formula becomes — = T, where c c is the molecular (molar) concentration. If the concentration is 1 and the temperature = o° C = 273 abs., p = .0821 X 273 = In other words, the osmotic pressure of a molar solution is atmospheres at o°. From this a method was developed of determining the extent of dissociation of an electrolyte from its osmotic pressure. If 1 mol KG is dissolved in so large a volume of water that it is completely dissociated it will exert double the pressure of 1 mol dextrose dissolved in the same volume, because the number of ions is double the number of molecules, and the formula becomes pv = 2RT. If the salt is partly dissociated a number somewhere between 1 and 2 must be used (say ), then 50 per cent of the salt is dissociated. The most accurate determinations of osmotic pressure have been done on sugars by H. N. Morse (1914) and Berkeley and Hartley (1904). Morse made some determinations on elec-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McClendon, J. F. (Jesse Francis), b. 1880. Princeton, Princeton University Press
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