Solubility of ammonia in pure aqueous and multicomponent solutions

Journal Article · Thu Oct 05 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100357a041· OSTI ID:7179815

Clegg, S L ^[1]; Brimblecombe, P ^[2]

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1. Plymouth Marine Lab. (England)
2. Univ. of East Anglia, Norwich (England)

The thermodynamic Henry's law constant (K{sub H}/mol kg{sup {minus}1} atm{sup {minus}1}) of the weak electrolyte NH{sub 3} is described by the equation ln (K{sub H}) = {minus}8.09694 + 3917.507/T {minus}0.00314T, from 372 to 313 K. Measured NH{sub 3} solubilities in both pure aqueous and multicomponent solutions agree well with calculations using the Pitzer thermodynamic model to predict osmotic and activity coefficients. Partial pressure and heat of dilution data were used to determine the activity coefficient of NH{sub 3} ({gamma}{sub NH{sub 3}}). In pure aqueous solutions where dissociation is not significant this is given by {gamma}{sub NH{sub 3}} = exp(2m{sub NH{sub 3}}{lambda}{sub NH{sub 3}}{sub NH{sub 3}}), where {lambda}{sub NH{sub 3}}{sub NH{sub 3}} = 0.033161 - 21.12816/T + 4665.1461/T{sup 2} from 273 to 313 K. Ion-NH{sub 3} interaction parameters were obtained by using partial pressure, salt solubility, and partitioning data for the following ions at 298.15 K; Li{sup +}, Na{sup +}, K{sup +}, NH{sub 4}{sup +}, Mg{sup 2+}, Ca{sup 2+}, Sr{sup 2+}, Ba{sup 2+}, F{sup {minus}}, Cl{sup {minus}}, Br{sup {minus}}, I{sup {minus}}, OH{sup {minus}}, CNS{sup {minus}}, NO{sub 3}{sup {minus}}, NO{sub 2}{sup {minus}}, ClO{sub 3}{sup {minus}}, ClO{sub 4}{sup {minus}}, S{sup 2{minus}}, SO{sub 3}{sup 2{minus}}, CH{sub 3}COO{sup {minus}}, HCOO{sup {minus}} and (COO){sub 2}{sup 2{minus}}. Parameter values are found to be simply related to ion charge and size.

• OSTI ID: 7179815
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:20; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
100300* -- Synthetic Fuels-- Properties & Composition-- (1990-)
AMMONIA
AQUEOUS SOLUTIONS
CALCULATION METHODS
CHEMICAL REACTION KINETICS
DATA
DATA ANALYSIS
DISPERSIONS
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
MIXED SOLVENTS
MIXTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
REACTION KINETICS
SOLUBILITY
SOLUTIONS
SOLVENTS