In the case of airwater interface the mole fraction

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Unformatted text preview: sents the maximum amount of solid that can be dissolved in a liquid at a specified temperature and is widely available in chemistry handbooks. In Table 161 we present sample solubility data for sodium chloride (NaCl) and calcium bicarbonate [Ca(HO3)2] at various temperatures. For example, the solubility of salt (NaCl) in water at 310 K is 36.5 kg per 100 kg of water. Therefore, the mass fraction of salt in the saturated brine is simply mfsalt,liquid side msalt m 36.5 kg 1100 36.52 kg 0.267 1or 26.7 percent 2 x Air | 811 yH 2O,gas side Jump in concentration Water Concentration profile yH 2O,liquid side 1 FIGURE 1622 Unlike temperature, the mole fraction of species on the two sides of a liquidgas (or solidgas or solidliquid) interface are usually not the same. TABLE 161 Solubility of two inorganic compounds in water at various temperatures, in kg (in 100 kg of water) (from Handbook of Chemistry, McGraw-Hill, 1961) whereas the mass fraction of salt in the pure solid salt is mf 1.0. Many processes involve the absorption of a gas into a liquid. Most gases are weakly soluble in liquids (such as air in water), and for such dilute solutions the mole fractions of a species i in the gas and liquid phases at the interface are observed to be proportional...
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