Chapter 13 - Diffusion Coefficient in Water – Inorganic Compounds

Abstract

This chapter presents the values for diffusion coefficient in water (inorganic compounds) in tabulated format. For the tabulation, an equation is selected for diffusion coefficient at infinite dilution in water as a function of temperature. The tabulation is arranged by alphabetical order such as Ag, Al, Ar, and Zr to provide ease of use in quickly locating the data by using the chemical formula. The compound name and chemical abstracts registry number (CAS No) are also provided in tabular form. Values for regression coefficients are given in the adjacent columns. The temperature range for use is also given in the columns (TMIN and TMAX). The equation should not be used for temperatures outside this range. The next column provides the code for the tabulation. The last three columns provide values for diffusion coefficient at infinite dilution in water at representative temperatures. Data for polar and high molecular weight compounds are very limited. Also, few experimental data are available at high temperatures. Thus, the values for these compounds and high temperatures should be considered rough approximations. The values at lower temperatures in the region of ambient conditions are more accurate. A comparison of calculated and data values is also presented for a representative compound. The graph shows favorable agreement of equation and data.