Vibrational spectral studies of solutions at elevated temperatures and pressures. 12. Magnesium acetate

Details Vibrational spectral studies of solutions at elevated temperatures and pressures. 12. Magnesium acetate Vibrational spectral studies of solutions at elevated temperatures and pressures. 12. Magnesium acetate

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..947s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 4, pp.947-954

Computer Science

Scientific paper

Raman spectra of aqueous solutions of magnesium acetate at temperatures from 25 to 250°C and at a pressure of 9 MPa have been studied to determine the cumulative formation constants for magnesium acetate complexes. The spectra obtained were analysed using bandfitting techniques, the Gauss-Z least squares method, and Factor Analysis with Equilibrium Constraints (FAEC). The results of this study suggest the presence of two complexes, [Mg(H 2 O) 5 OAc] + and [Mg(H 2 O) 4 (OAc) 2 ](where OAc - refers to CH 3 COO - ), at 25, 50, 100, and 150°C. The existence of a third complex [Mg(H 2 O) 3 (OAc) 3 ] - is also suggested at 150°C. Average enthalpies of formation were estimated as 9.0 ± 1.2 kJ mol -1 for the 1:1 complex and 17.0 ± 1.2 kJ mol -1 for the 1:2 complex.

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