Abstract
The apparent, φ v , and partial, \(\bar V_2 \) molal volumes of dilute (0.02 to 0.7m) aqueous boric acid, B(OH)3, and sodium borate, NaB(OH)4, solutions have been determined from 0 to 50° C from precision density measurements. The φ v of boric acid is a linear function of the first power of concentration. For sodium borate, the Debye-Hückel theoretical limiting law slope for the φ v as a function of the square root of molar concentration is approached at all temperatures studied. The positive deviations at higher concentrations increase with decreasing temperature. The infinite-dilution volume properties of both B(OH)3 and NaB(OH)4 indicate that these solutes behave like “structure breakers” between 0 and 50°C (that is ∂2φ ° v /∂T2 is negative). The volume change for the ionization of boric acid in water \(\Delta \bar V^\circ \), is calculated from the volume data at various temperatures. This volume change has been used to estimate the effect of pressure on the ionization of boric acid solutions from 0 to 50°C and 0 to 1000 bars. The calculated effect of pressure on the ionization is in good agreement with direct measurements.
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Taken from a thesis submitted by Gary K. Ward in partial fulfillment of the requirements of the Master of Science degree, University of Miami, Miami, Florida 33149.
Scientific Contribution Number 1726 from the University of Miami, Rosenstiel School of Marine and Atmospheric Science, Miami, Florida 33149.
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Ward, G.K., Millero, F.J. The effect of pressure on the ionization of boric acid in aqueous solutions from molal-volume data. J Solution Chem 3, 417–430 (1974). https://doi.org/10.1007/BF00651533
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DOI: https://doi.org/10.1007/BF00651533