IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Water

Components:
   (1) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Yuan, C-B.; Yang, J-Z., Gaodeng Xuexiao Huaxue Xuebao 1993, 14, 80-3.

Variables:
   Temperature = 278.15 K to 318.15 K
   Pressure = 101.325 kPa

Prepared By:
   Pirketta Scharlin; Xiaohui Shen

Experimental Remarks:

   The experimental solubilities from Table 1 were fitted to an equation

      lg S₁ = A/T + B + CT      (1)

The coefficients of eq. (1) and the standard deviation in lg S₁ are listed in Table 2.

Experimental Data: (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)

Table 1. Solubility of CO₂ in water
T/K	10² * Keunen coefficient, S [mol/kg]	S Note
278.15	6.11	a
288.15	4.29	a
298.15	3.13	a
308.15	2.56	a
318.15	2.10	a

Table 2. Coefficients of eq. (1) for smoothed results for solubility of CO₂ in water
StandardDeviation	Standard Deviation Note	Equation(s)
0.2	a	A = 4608.8; B = -28.953; C = 0.04018 where lg S<1> = A/T + B +CT

Notes:
   Table 1  ^a  S₁ = solubility of CO₂
   Table 2  ^a  σ = standard deviation in lg S₁

Method/Apparatus/Procedure:
   Static-state method. The authors designed a solubility apparatus which is composed of three isothermal presaturators, saturator and sampler. A schematic diagram of the apparatus is in the original source. CO₂ was introduced (10 hours) through the presaturators and the saturator which contained about 120 g of solvent. The equilibrated sample (about 100 g) was transferred from the saturator into the weighed sampler which contained a weighed amount of standard NaOH solution. The sampler was weighed again and shaken to complete the reaction between CO₂ and NaOH. The excess of NaOH and the NaHCO₃ was titrated potentiometrically with standard HCl solution. The mass of dissolved CO₂ was calculated from the equation: w = c_HCl(V₂-V₁)M
where w = mass of dissolved CO₂, c_HCl = concentration of HCl; V₁ and V₂ are volumes of the HCl solution to the first and second end point, respectively, and M = molar mass of CO₂.
(The authors also report solubilities of CO₂ in 15 mass % glucose/H₂O and in NaCl + 15 mass % glucose/H₂O.)

Source and Purity of Materials:
   (1) Purity of CO₂ 99.95 %.
   (2) Double deionized. Conductivity of H₂O was < 1.5 x 10^-4 S m^-1

Estimated Errors:

   Temperature: δT/K = ± 0.02
When fitting the data to the equation 1g S₁ = A/T + B + CT, the standard deviation was σ = 0.02. (Table 2.)