Sabtu, 05 Juni 2010

Partial molal volume

Knowledge of the solution is very important, because the greater the chemical and biological reactions that occur in the form of liquids, especially in the form of a solution with solvent water. Solution can be defined as a homogeneous system which consists of two components or more substances. The term of solvents and solutes can actually exchanged, but the term usually used for liquid solvent, when the solution consists of solids or gases in liquids. This term for other types of solutions commonly used to express the substance contained in a larger quantity. Components are much less common is called the solute. All of the gas can be mixed with each other. Therefore, all the gas mixture is a solution. Liquids in general can dissolve a variety of solids, other liquids, and gases can form a solution. When the solvent water, the solution formed is known as a solvent solution with water. Solid solution is formed when gases, liquids or other solids dissolved in solution. Solid solution is not very important in biological systems, but it is very important in metallurgy.

Not all systems have a simple properties like the binary system. Some systems during the fractional distillation can only produce a pure component alone. The rest was a mixture that has a fixed boiling point. One example of a mixture that produces the minimum boiling point of ethanol-water system. In such a system, not pure alcohol may be produced by fractional distillation. When several substances are mixed together, the total volume of the mixture is generally different from the total volume of individual components. Or contraction of the reaction force between molecules intermolecular intermolecular emerged from a mixture of styles between the molecules, and very real when the two substances is the solution. Rate of change of the volume described quantitatively in the partial molal volume of formula from.

In the experiment we measure the partial molal volume of ethanol in water at different concentrations. Partial molal volume is very effective for calculating the volume of one mole of ethanol in concentrated solution, which differs from the volume of one mole of pure ethanol. A very common method is to calculate the precise mass of the known volume of a solution computed on a calibrated glass vessel called piknometer. Piknometer quite difficult to use, even then, and in this experiment, we can calculate the density of a known solution with sinker - quartz stone weights tied to the arms of chemical equilibrium, which is immersed in solution (Matthews, P. 1985) Solvents used in chemical examination of not only water, but can also nirair solvent (not water). The role of solvent-solvent will be described in detail in this chapter. This description begins with an explanation of the solvent properties of water and solvent properties nirair, followed by a discussion of the interplay of solvent-solvent and mutual influence between ions in the solvent. At the end of this chapter discussed the role of solution ionic strength in influencing chemical equilibrium, which in turn will affect the chemical examination.

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