Elementary Principles 202

# Elementary Principles 202 - 6.51 a. SO2 is hazardous and...

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6- 36 6.51 a. – SO 2 is hazardous and should not be released directly into the atmosphere, especially if the analyzer is inside. From Henry’s law, the partial pressure of SO 2 increases with the mole fraction of SO 2 in the liquid, which increases with time. If the water were never replaced, the gas leaving the bubbler would contain 1000 ppm SO 2 (nothing would be absorbed), and the mole fraction of SO 2 in the liquid would have the value corresponding to 1000 ppm SO 2 in the gas phase. b. Calculate mol SO mol in terms of g SO g H O 22 2 xr bg b g 100 Basis: 100 g H O 1 mol 18.02 g mol H O (g SO 1 mol 64.07 g (mol SO mol SO mol SO 2 2 = = ⇒= + F H G I K J 555 0 01561 0 01561 555 0 01561 . ). ) . .. rr x r r From this relation and the given data, px SO SO 2 mmHg mol SO mol = = 00 42 1.4 x 10 –3 85 2.8 x 10 –3 129 4.2 x 10 –3 176 5.6 x 10 –3 A plot of p SO 2 vs. x SO 2 is a straight line. Fitting the line using the method of least squares (Appendix A.1) yields pH x SO SO SO 2 = di , H mm Hg mole fraction SO 2 3136 10 4 . c. () 2 4 2S O 6 4 SO SO 100 mol SO mol SO 100 ppm SO
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