Abstract
Chemical reaction between a reactive gas and an aerosol droplet can lead to the formation of a coated particle if the reaction rate is fast compared with diffusion within the droplet and if a reaction product has low solubility in the solution. The problem of diffusion and simultaneous reaction is analyzed analytically and numerically, and the results are applied to existing data on the reaction between a phosphoric acid droplet and ammonia in an ammonia-air gaseous mixture. Estimates of the reaction rate constant and the solubility of ammonia in the phosphoric acid are made based on comparisons between theory and experiment. In addition, the supersaturations required to precipitate ammonium orthophosphate-dihydrogen are determined.
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