Equilibrium constants for the hydrolysis of Th IV at

The selection of reliable data for mononuclear species Th(OH) is difficult, because they are usually minor species under the conditions used in potentiometric studies. In addition, most equilibrium constants reported for mononuclear complexes have been determined in solutions where the predominant species are polynuclear, a fact that the authors in some cases have neglected when interpreting the data (c/ Appendix A reviews of [1955PAN/HSE], [1963BIL/FUR], [1964NAB/KUD], 

The present review uses the SIT to evaluate the equilibrium constants at zero ionic strength, logj 298.15 K), for the reactions  

They are related to the conditional constants logm / , medium MX or MX2 by  

If sufficient data at different ionic strengths are available, the linear SIT regression (VI1.22) is used for the extrapolation to 7 = 0  

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