Title

|nI.|pA calorimetric study of the heat of ionization of water at 10 and 40°C, and,|nII.|pA calorimetric determination of the heat of reaction of tris (hydroxymethyl) aminomethane (tham) with hydrochloric acid in aqueous solution at 10, 25, and 40°C

Abstract

The heat of neutralization, ΔH_-N, of perchloric acid with sodium hydroxide has been determined at 10 and 40° in a low ionic strength, μ, region using a nonisothermal, constant-temperature-environment solution calorimeter. Correction of the data to infinite dilution by extrapolation of a plot of ΔH_-N vs μ^0.5 gives values at zero ionic strength for the heat of ionization of water of 14.216 and 12.695 kcal/mole, respectively, at 10 and 40° . The data are correlated with those of earlier workers to give an equation allowing the calculation of the heat of ionization of water at zero ionic strength over the temperature range 0-55°. The heat of reaction of tris(hydroxymethyl)aminomethane (THAM) with 0.1 M hydrochloric acid solution has been determined calorimetrically at 10, 25, and 40° C. The experimental conditions suggested by the Standards Committee of the U.S. Calorimetry Conference were followed. ΔH values of -7.644 ± 0.014, -7.104 ± 0.008, and -6.555 ± 0.012 kcal/mole at 10, 25, and 40° C, respectively, are reported. Results of the study are compared with those of other workers, and THAM is recommended for use as an interlaboratory comparison standard for solution calorimetry.

Degree

MS

College and Department

Chemistry and Biochemistry

Rights

http://lib.byu.edu/about/copyright/

Date Submitted

1973-04-01

Document Type

Thesis

Handle

http://hdl.lib.byu.edu/1877/Letd596

Keywords

Thermochemistry, Calorimetry

Language

English

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