Interpretation:
The pressure of the compound if it would boil at
Concept introduction:
Distillation is a liquid-gas separation technique for two or more liquids on the basis of their difference in boiling point or vapor pressure. Vapor pressure is the pressure exerted by the vapor phase of liquid produced due to an increase in the kinetic energy of molecules in the liquid phase due to the increase in temperature.
The boiling point is defined as the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid. The boiling point of a mixture depends on the vapor pressure of the components. Impurities in the mixture might result in an increase or decrease of observed boiling point.
The boiling point of any compound at a pressure other than
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Laboratory Techniques in Organic Chemistry
- xplain the following: You add 100mLof water to a 500mLround-bottomed flask and heat the water until it is boiling. You remove the heat and stopper me flask, and the boiling stops. You then run cool water over the neck of the flask, and me boiling begins again. It seems as though you are boiling water by cooling it.arrow_forward8.51 Suppose that three unknown pure substances are liquids at room temperature. You determine that the boiling point of substance A is 53°C, that of substance B is 117°C, and that of substance C is 77°C. Based on this information, rank the three substances in order of their vapor pressures at room temperature.arrow_forwardExplain why liquids assume the shape of any container into which they are poured, whereas solids are rigid and retain their shape.arrow_forward
- Indicate whether each of the following statements concerning boiling and boiling point is true or false. a. A liquid can be made to boil at temperatures higher than its normal boiling point. b. A liquid can be made to boil at temperatures lower than its normal boiling point. c. In a boiling liquid, vapor formation occurs within the body of the liquid. d. To compare the boiling points of two different liquids, the external pressure should be the same.arrow_forwardThe vapor pressure of ethanol, C2H5OH, at 50.0 C is 233 mmHg, and its normal boiling point at 1 atm is 78.3 C. Calculate the vapH of ethanol.arrow_forwardUse Figure 11.7 to estimate the boiling point of diethyl ether, (C2H5)2O, under an external pressure of 470 mmHg.arrow_forward
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