15_09_86 - Temperature range (C) RH (25C) A B NaOH H 2 O...

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CONSTANT HUMIDITY SOLUTIONS Anthony Wexler An excess of a water soluble salt in contact with its saturated solution and contained within an enclosed space produces a con- stant relative humidity and water vapor pressure according to RH = A exp( B/T ) where RH is the percent relative humidity (generally accurate to ±2 %), T is the temperature in kelvin, and the constants A and B and the range of valid temperatures are given in the table below. The vapor pressure, p , can be calculated from p = ( RH /100) × p 0 where p 0 is the vapor pressure of pure water at temperature T as given in the table in Section 6 titled “Vapor Pressure of Water from 0 to 370°C”. References 1. Wexler, A. S. and Seinfeld, J. H., Atmospheric Environment , 25A, 2731, 1991. 2. Greenspan, L., J. Res. National Bureau of Standards , 81A, 89, 1977. 3. Broul, et al., Solubility of Inorganic Two-Component Systems , Elsevier, New York, 1981. 4. Wagman, D. D. et al., J. Phys. Chem. Ref. Data, Vol. 11, Suppl . 2, 1982. Compound
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Unformatted text preview: Temperature range (C) RH (25C) A B NaOH H 2 O 1560 6 5.48 27 LiBr 2H 2 O 1030 6 0.23 996 ZnBr 2 2H 2 O 530 8 1.69 455 KOH 2H 2 O 530 9 0.014 1924 LiCl H 2 O 2065 11 14.53 75 CaBr 2 6H 2 O 1122 16 0.17 1360 LiI 3H 2 O 1565 18 0.15 1424 CaCl 2 6H 2 O 1525 29 0.11 1653 MgCl 2 6H 2 O 545 33 29.26 34 NaI 2H 2 O 545 38 3.62 702 Ca(NO 3 ) 2 4H 2 O 1030 51 1.89 981 Mg(NO 3 ) 2 6H 2 O 535 53 25.28 220 NaBr 2H 2 O 035 58 20.49 308 NH 4 NO 3 1040 62 3.54 853 KI 530 69 29.35 254 SrCl 2 6H 2 O 530 71 31.58 241 NaNO 3 1040 74 26.94 302 NaCl 1040 75 69.20 25 NH 4 Cl 1040 79 35.67 235 KBr 525 81 40.98 203 (NH 4 ) 2 SO 4 1040 81 62.06 79 KCl 525 84 49.38 159 Sr(NO 3 ) 2 4H 2 O 525 85 28.34 328 BaCl 2 2H 2 O 525 90 69.99 75 CsI 525 91 70.77 75 KNO 3 050 92 43.22 225 K 2 SO 4 1050 97 86.75 34 15-33...
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This note was uploaded on 12/31/2011 for the course CHEMISTRY 101 taught by Professor Dr.dason during the Fall '08 term at Davenport.

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