IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with various salts and acids, see data table below and 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:
   Kobe, K. A., Williams, J. S., Ind. Eng. Chem. 1935, 7 (1), 37-8.

Variables:
   Temperature = 298.15 K
   Pressure = 104.46 kPa
   Concentration = 10²w₂ = 0 - 50

Prepared By:
   Pirketta Scharlin

Experimental Remarks:

   Total pressure P in the measurements was 783.5 mmHg (104.46 kPa, 1.045 bar), and temperature 25 °C (298.15 K).

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


Chemical Name	Keunen coefficient, S	S Note	Mass Fraction (w₂)	w2 Note	α	α Note
Water; H2O; [7732-18-5)	0.823	(b)	-	(a)	0.754	(c)
Sulfuric acid; H2SO4; [7664-93-9]	0.746	(b)	5	(a)	0.683	(c)
Sulfuric acid; H2SO4; [7664-93-9]	0.717	(b)	10	(a)	0.657	(c)
Sodium chloride; NaCl; [7647-14-5]	0.551	(b)	10	(a)	0.505	(c)
Sodium chloride; NaCl; [7647-14-5]	0.334	(b)	20	(a)	0.306	(c)
Sodium chloride; NaCl; [7647-14-5]	0.257	(b)	25	(a)	0.236	(c)
H2S04 (5 mass %) + NaCl (20 mass %)	0.328	(b)	-	(a)	0.302	(c)
Hydrochloric acid; Hcl; [7647-01-0]	-	(b)	2	(a)	-	(c)
NaCl	0.352	(b)	20	(a)	0.323	(c)
Sodium sulfate; Ma2SO4; [7757-82-6]	0.260	(b)	20	(a)	0.237	(c)
H2S04 (5 vol. %) + Na2SO4 (20 mass %)	0.263	(b)	-	(a)	0.242	(c)
Phosphoric acid; H3PO4; [7664-38-2]	-	(b)	7	(a)	-	(c)
Sodium phosphate; Na3PO4; [7601-54-9]	0.280	(b)	10	(a)	0.256	(c)
Calcium chloride; CaCl2 [10043-52-4]	0.158	(b)	40	(a)	0.144	(c)
Magnesium chloride; MgCl2; [7786-30-3)	0.164	(b)	30	(a)	0.150	(c)
Zinc chloride; ZnCl2; [7646-85-7]	0.386	(b)	50	(a)	0.354	(c)
Aluminium chloride; AlCl3; [7446-70-0]	0.243	(b)	25	(a)	0.222	(c)
Aluminium sulfate; Al2(SO4)3; [10043-01-3]	0.221	(b)	20	(a)	0.203	(c)

Notes:
   ^a  w₂ =mass fraction of component 2. (10²w = mass %)
   ^b  S₁ = solubility of CO₂ expressed as mL of CO₂ per mL of solution at a partial pressure of 760 mmHg (101.325 kPa, 1.013 bar) of CO₂.
   ^c  α = Bunsen coefficient [cm³ (STP) cm^-3 atm^-1].

Method/Apparatus/Procedure:
   All-glass apparatus. The total pressure was kept constant during equiliration. The equilibration cell was shaken in a constant temperature bath. After equilibration, a liquid sample was volumetrically analyzed for solution and CO₂ content.
Detailed description given in the original source.

Source and Purity of Materials:
   (1) "Pure". Saturated with water vapor.
   (2) Analytical grade.
   (3) Distilled.

Estimated Errors:
   Solubility: δα = ± 0.005 (by author)