The dissociation of oxy-acids at elevated temperatures

Details The dissociation of oxy-acids at elevated temperatures The dissociation of oxy-acids at elevated temperatures

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..137s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 1, pp.137-142

Physics

2

Scientific paper

The heat capacities of dissociation for carbonic, bicarbonate, phosphoric, biphosphate, silicic, nitric, boric and bisulfate oxy-acids have been evaluated at temperatures up to 300°C using published dissociation constants, heat capacities and a model which explicitly accounts for both electrostatic and nonelectrostatic contributions to the thermodynamic properties of dissociation. The heat capacities calculated are independent of the entropies of dissociation or the chemical characteristics of the acids, and are the same for all acids of a given dissociation type ( i.e. , 1st, 2nd, etc.). The average deviation between measured and calculated log K T 's is less than 0.05 log units in the temperature range from 25 to 300°C. Dissociation constants for acetic acid can be accurately calculated using the oxy-acid heat capacity expression. The heat capacities are used to calculate dissociation constants for the oxy-acids of Cr(VI), N(III), S(IV), S(II), Se(IV), Se(VI), As(III), As(V), Te(VI), Cl(I), Cl(III), I(V) and C 1 -C 3 aliphatic acids to temperatures of 300°C.

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