Second ionization of carbonic acid in NaCl media to 250�C

The origin of Zn isotope fractionation in sulfides

“…The acid dissociation constant between the 345 hydrogen carbonate ion (HCO 3 − ) and the carbonate ion (CO 3 2− ) is the ratio of . These values at 298, 423, and 573 K (Smith et al, 1986), in which the 347 original data are taken from (Patterson et al, 1982;1984), are shown in Table 4. 348…”

“…The ionization of carbonic acid at elevated temperatures has been studied by Read 344 (1975) and Patterson et al (1982Patterson et al ( , 1984. The acid dissociation constant between the 345 hydrogen carbonate ion (HCO 3 − ) and the carbonate ion (CO 3 2− ) is the ratio of .…”

Solubility equilibria. From data optimization to process simulation

“…The equilibrium constant of reaction 11 can be obtained by combining the second dissociation constant of carbonic acid and the ionic product of water. Both quantities have been measured at temperatures up to 250°C and in NaCl media up to 5 mol kg -1 in ionic strength [18,19]. Figures 2a and 2b compare these data with predictions from the CHC model [7].…”

“…Figure 2a shows a very good agreement for the hydrolysis constant at infinite dilution to at least 225°C (it has been noted in ref. [19] that plots of log K vs. 1/T are in general close to linear for such reactions). In NaCl media, the hydrolysis constant is well represented by the model of ref.…”

“…The values of the parameter n derived above for NaCl(aq) were employed for both Na 2 CO 3 (aq) and NaHCO 3 (aq). Standard partial molar heat capacities of [18,19]. Solid lines, calculated from the CHC model with data of ref.…”