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The dissociation constant of ammonium nitrate and its dependence on temperature, relative humidity and particle size



The dissociation constant of ammonium nitrate and its dependence on temperature, relative humidity and particle size



Atmospheric Environment Part A General Topics 27(2): 261-270



The dissociation constant of NH4NO3(c, IV) is determined from the evaluation of literature data from a variety of sources. Three different methods of calculation using five independent data sets lead to accurate values of the dissociation constant; these are in excellent agreement with each other. The recommended value of the standard free energy of dissociation of NH4NO3 (c, IV) to NH3(g) and HNO3(g) is 93.4±0.3 kJ mol1. Over the temperature range for which crystalline phase IV is stable (17 to 32°C), the temperature dependence of the dissociation constant (in units of nb2) is given to within ±12% by ln(Kp)=118.8724084T6.025ln(T).

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Accession: 033758389

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DOI: 10.1016/0960-1686(93)90356-4


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