You are a member of a group assigned to experimentally determine the behavior of certain mixtures that are to be used in a new process. Your first task is to make a 1000-ml mixture that is roughly equimolar in isopropanol and water; then you will determine the exact composition to within ±0.002 mole fraction. Your equipment consists of a 1000-ml volumetric flask, assorted pipettes and graduated cylinders, a thermometer, a barometer, a library, and a brain. You measure 300 ml of water and stir it into 700 ml of alcohol—Oops!—the meniscus falls below the 1000-ml line. Must have been careless. You repeat the procedure: same result. Something doesn’t seem right.
At the daily meeting it quickly becomes clear that other members of the group are also perplexed. For example, Leia reports that she’s getting peculiar results with the isopropanol-methyl(ethyl)ketone mixtures: her volumes are greater than the sum of the pure component volumes. Meanwhile, Luke has been measuring the freezing points of water in ethylene glycol and he claims that the freezing point of the 50% mixture is well below the freezing points of both pure water and pure glycol. Then Han interrupts to say that 50:50 mixtures of benzene and hexafluorobenzene freeze at temperatures higher than either pure component.
These conflicting results are puzzling; can they all be true? To keep the work going efficiently, the group needs to deal with the phenomena in an orderly way. Furthermore, you want to understand what’s happening in these mixtures so that next time you won’t be surprised.
Part I. The Basics
2. The First and Second Laws
3. Fundamental Relations
Part II. Single-Phase Systems
4. Properties Relative to Ideal Gases
5. Properties Relative to Ideal Solutions
6. Relations Among Relations
Part III. Multiphase and Reacting Systems
7. Transfers, Transformations, and Equilibria
8. Criteria for Observability
9. Phase Diagrams for Real Systems
Part IV. Engineering Calculations
10. Options for Equilibrium Calculations
11. Elementary Computational Procedures
12. Selected Applications
Enlaces Públicos de descarga