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An Apparatus for Fast Dilution

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V. P. Boiko

Institute of Macromolecular Chemistry, National Academy of Sciences, 48 Kharkov Shaussee, Kiev, 253160, Ukraine

J. Chem. Educ., 1997, 74 (4), p 439

DOI: 10.1021/ed074p439

Publication Date (Web): April 1, 1997

Section:

History, Education, and Documentation

Abstract

An apparatus for fast dilution permitting unlimited dilution of the solution in the same vessel is described. This was achieved by using a siphon to remove part of the solution from the dilution vessel. Availability of a siphon provides strictly constant solution volume in the vessel after evacuation of excess solution by extra pressure. By virtue of subsequent dilution of a solution it can achieve any low solution concentration. The apparatus is especially convenient at simultaneously measuring the concentration dependent solution properties, e. g., for calibration curve plotting or for determining intrinsic values of physical properties of a solute. Using the apparatus described decreases the time of dilution and property measuring solutions and labor expenditures. The apparatus has a number of other advantages. Accuracy of measurements greatly increases especially at very high dilution. The degree of dilution is easily regulated; simultaneous measurements of two or more properties of the same solution are possible; mixtures of liquids of variable composition are quickly prepared. The versions of the apparatus for measuring limiting equivalent conductivity and polymer intrinsic viscosity are proposed.