Constant ebullioscopic

The ebullioscopic constant, a characteristic property of the solvent, may be calculated from the relation ... 

Where M is the molecular weight of the solute, Dt is the elevation of boiling point in °C, c is the concentration of solute in grams for lOOOgm of solvent, and K is the Ebullioscopic Constant (molecular elevation of the boiling point) for the solvent. K is a fixed property (constant) for the particular solvent. This has been very useful for the determination of the molecular weights of organic substances in solution. 

Table 5.3 Sample values of boiling and freezing points, and cryoscopic and ebullioscopic constants...

Plot the change in the saturated vapour pressure of water over pure water and an aqueous solution of sugar (sodium chloride) against the temperature. How does the freezing (boiling) point of water change when it contains solutes (sugar, sodium chloride) Define the cryoscopic and ebullioscopic constants of water. What is their numerical value State Raoult s laws and write their mathematical expression. How can the molecular masses of solids be determined ... 

Substance Formula Cryoscopio constant, C Ebullioscopic constant, G... 

Physical Properties.—Sulphuryl chloride is a colourless, fuming liquid, with an extremely pungent odour. Z)2 = 1-6074 ->t " = l-4437. It boils at 69-1° C. at 760 mm. pressure, and freezes at —46° C.5 The vapour density is normal at first, but when the chloride is kept, even at 100° C., its vapour commences to dissociate into sulphur dioxide and chlorine. At 200° C. dissociation is almost complete.6 When dissolved in benzene the substance shows a molecular- weight corresponding with S02C12. At ordinary temperatures the specific heat is 0-233, the latent heat of evaporation 32-4 calories per gram, and the heat of formation from the elements approximately 89,540 calories per gram-molecule.7 The dielectric constant at 20° C. is 8-5. As a solvent, the ebullioscopic constant of sulphuryl chloride has been found to have... 

TABLE 4.6 Molecular Elevation of the Boiling Point Ebullioscopic constants... 

This effect is fairly modest. For example, we all know that you cook pasta in salted water. Do we add salt to increase the boiling point of the water or to season the pasta Well, a typical recipe might call for 4 L of water (which has a mass of 4 kg) and 2 tablespoons of salt, or about 40 g. The ebullioscopic constant of water is 0.512 °C/molal. 

KolossowskylJa =lS 2, M a lE=l-23xlO (fl2=specific cohesion, =ebullioscopic constant). 

The following table gives the values of the ebullioscopic constant for some important solvents. 

We notice that the ebullioscopic constants of most solvents are only C. S. Hoyt and C. K. Finck, J. Phys. Chem., 41, 453 (1937). 

Ebullioscopic constant (T ) - The constant that expresses the amount by which the boiling point of a solvent is raised by a non-dissociating solute, through the relation AT = m, where m is the molality of the solute. 

EBULLIOSCOPIC CONSTANTS FOR CALCULATION OF BOILING POINT ELEVATION... 

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