Experimental Determination of Solubilities of Brucite [Mg(OH)2(cr)] in Na2SO4 Solutions with Borate to High Ionic Strengths: Interactions of MgB(OH) 4 + with Na2SO4
| Autor: | Leslie Kirkes, Terry Westfall, Yongliang Xiong |
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| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Chemistry Brucite Biophysics Analytical chemistry Ionic bonding chemistry.chemical_element 02 engineering and technology engineering.material 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Dilution Stability constants of complexes Ionic strength engineering Physical and Theoretical Chemistry Solubility 0210 nano-technology Boron Molecular Biology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Solution Chemistry. 47:595-610 |
| ISSN: | 1572-8927 0095-9782 |
| DOI: | 10.1007/s10953-018-0742-z |
| Popis: | In this work, a solubility study on brucite [Mg(OH)2(cr)] in Na2SO4 solutions ranging from 0.01 to 1.8 mol·kg−1, with 0.001 mol·kg−1 borate, has been conducted at 22.5 °C. Based on the solubility data, the Pitzer interaction parameters for MgB(OH) 4 + − SO 4 2− and MgB(OH) 4 + − Na+ along with the formation constant for MgSO4(aq) are evaluated using the Pitzer model. The formation constant ( $$ \log_{10} \beta_{1}^{0} $$ = 2.38 ± 0.08) for MgSO4(aq) at 25 °C and infinite dilution obtained in this study is in excellent agreement with the literature values. The experimental data on the solubility of gypsum (CaSO4·2H2O), at 25 °C, in aqueous solutions of MgSO4 with ionic strengths up to ~ 11 mol·kg−1 were analyzed using models with and without considering the MgSO4(aq) species. The model incorporating MgSO4(aq) fits better to the experimental data than the model without MgSO4(aq), especially in the ionic strength range beyond ~ 4 mol·kg−1, demonstrating the need for incorporation of MgSO4(aq) into the model to improve the accuracy. |
| Databáze: | OpenAIRE |
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