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  • 1
    Electronic Resource
    Electronic Resource
    The effect of pressure on the dissociation of boric acid and sodium borate ion pairs at 25°C (1989)
    Springer
    Journal of solution chemistry 18 (1989), S. 675-689 
    Details
    ISSN: 1572-8927
    Keywords: Acid dissociation constant ; acid-base indicator ; pressure-dependent spectrophotometric measurements ; sodium borate ion pair ; ion association
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A high pressure UV-visible spectrophotometer was used to determine the dissociation constant of boric acid using an indicator technique. The measurements were made at 25°C and at ionic strengths of 0.1 and 1.0m over a pressure range of 1 to 2000 atm. Extrapolation to I=0 gave a thermodynamic dissociation constant of 5.16×10−10 at 1 atm. The pressure dependence yielded a partial molal volume change of −28.9 and −31.8 cm3-mol−1 and a compressibility change of −3.1 and −4.8×10−3 cm3-mol−1-atm−1 for the dissociation at I=0.1 and 1.0m, respectively. The association constant for the formation of the sodium borate ion pair was determined by comparing the acid constants in tetramethylammonium chloride to those in sodium chloride solutions. Extrapolation to I=0 yielded a KA for [NaB(OH)4] of 0.64 at 1 atm. The pressure dependence of KA gave $$\Delta \overline V ^o = 8.39 {\text{cm}}^{\text{3}} {\text{ - mol}}^{{\text{ - 1}}} $$ and $$\Delta \overline K ^o = 1.6 \times 10^{ - 3} {\text{cm}}^{\text{3}} {\text{ - mol}}^{{\text{ - 1}}} - atm^{ - 1} $$ for the formation of the ion pair.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651003
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  • 2
    Electronic Resource
    Electronic Resource
    The CO2-water system. I. Study of the slower hydration-dehydration step (1973)
    Springer
    Journal of solution chemistry 2 (1973), S. 357-372 
    Details
    ISSN: 1572-8927
    Keywords: Relaxation kinetics ; pressure jump ; concentration jump ; stopped flow ; carbonic acid ; isotope effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Using pressure-jump, concentration-jump, and stopped-flow methods, we have studied the rate of dehydration (k−1) of carbonic acid as a function of temperature (0–40°C) and ionic strength (0.005–3M NaCl, 3M LiBr) in both H2O and D2O. A new design of pressure-jump cell with reliable temperature control, as well as improved sensitivity in the spectrophotometric detection for stopped flow, enabled k−1 values to be determined with an accuracy better than ±8%, based on a comparison of results obtained using five different techniques. The influence of ionic strength, temperature, and isotope effects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713250
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