Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract Henry's law constants K′H (mol kg−1 atm−1) for the reaction HOCl(g)=HOCl(aq) near room temperature, literature data for the associated enthalpy change, and solubilities of HOCl in aqueous H2SO4 (46 to 60 wt%) at temperatures relevant to the stratosphere (200 K≤T≤230 K) are shown to be thermodynamically consistent. Effective Henry's law constants [H*=mHOCl/pHOCl, in mol kg−1 atm−1] of HOCl in aqueous H2SO4 are given by: ln(H*)=6.4946−mH2SO4(−0.04107+54.56/T)−5862 (1/To−1/T) where T(K) is temperature and To=298.15K. The activity coefficient of HOCl in aqueous H2SO4 has a simple Setchenow-type dependence upon H2SO4 molality.
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