IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Sodium chloride and Water

Components:
   (1) Sodium chloride; NaCl; [7647-14-5]  NIST Chemistry WebBook for detail
   (2) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Harned, H.S.; Davis, R. Jr., J. Am. Chem. Soc. 1943, 65, 2030-7.

Variables:
   Temperature = 273.15 K to 323.15 K
   Pressure = 101.325 kPa
   Concentration = m₂/mol kg^-1 = 0 - 3

Prepared By:
   Pirketta Scharlin

Experimental Remarks:

   The authors made large scale plots of (-lg S₁) versus molality of NaCl. The smoothed values obtained from these graphs are given in Table 2.
The authors expressed the solubility data as a function of the absolute temperature by Eq. (1):
- lg S₁ = -A*/T + D* - C*T (1)
The parameters of equation (1), obtained from the data by method of least squares, are given in Table 3.
The deviations of the observed results from those calculated by Eq. (1) are given in parentheses immediately following the values in Table 2. The maximum deviation is 0.0036 and the average deviation is 0.0015 in lg S₁ which corresponds to 0.8 and 0.3 % in S₁.

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


t/°C	T/K	Temp Note	10² * Keunen coefficient, S	S Note	Molality m₂ [mol/kg]	m₂ Note	Method/Comments	Method Note
0	273.15	a	7.726	c	0	b	A	d
0	273.15	a	7.256	c	0.2	b	A	d
0	273.15	a	6.708	c	0.5	b	A	d
0	273.15	a	6.642	c	0.5	b	B	d
0	273.15	a	5.869	c	1	b	A	d
0	273.15	a	5.895	c	1	b	B	d
0	273.15	a	4.608	c	2	b	A	d
0	273.15	a	4.597	c	2	b	B	d
0	273.15	a	3.695	c	3	b	A	d
0	273.15	a	3.718	c	3	b	B	d
5	278.15	a	6.402	c	0	b	A	d
5	278.15	a	6.099	c	0.2	b	A	d
5	278.15	a	5.593	c	0.5	b	A	d
5	278.15	a	4.932	c	1	b	A	d
5	278.15	a	3.910	c	2	b	A	d
5	278.15	a	3.166	c	3	b	A	d
10	283.15	a	5.359	c	0	b	A	d
10	283.15	a	5.367	c	0	b	B	d
10	283.15	a	5.096	c	0.2	b	A	d
10	283.15	a	4.714	c	0.5	b	A	d
10	283.15	a	4.160	c	1	b	A	d
10	283.15	a	4.156	c	1	b	B	d
10	283.15	a	3.339	c	2	b	A	d
10	283.15	a	2.716	c	3	b	A	d
10	283.15	a	2.729	c	3	b	B	d
15	288.15	a	4.554	c	0	b	A	d
15	288.15	a	4.330	c	0.2	b	A	d
15	288.15	a	4.009	c	0.5	b	A	d
15	288.15	a	3.550	c	1	b	A	d
15	288.15	a	2.886	c	2	b	A	d
15	288.15	a	2.381	c	3	b	A	d
20	293.15	a	3.923	c	0	b	A	d
20	293.15	a	3.928	c	0	b	B	d
20	293.15	a	3.725	c	0.2	b	A	d
20	293.15	a	3.450	c	0.5	b	A	d
20	293.15	a	3.085	c	1	b	A	d
20	293.15	a	2.504	c	2	b	A	d
20	293.15	a	2.071	c	3	b	A	d
20	293.15	a	2.086	c	3	b	B	d
25	298.15	a	3.438	c	0	b	A	d
25	298.15	a	3.458	c	0	b	B	d
25	298.15	a	3.278	c	0.2	b	A	d
25	298.15	a	3.054	c	0.5	b	A	d
25	298.15	a	3.036	c	0.5	b	B	d
25	298.15	a	2.707	c	1	b	A	d
25	298.15	a	2.668*	c	1	b	B	d
25	298.15	a	2.734	c	1	b	C	d
25	298.15	a	2.223	c	2	b	A	d
25	298.15	a	2.227	c	2	b	B	d
25	298.15	a	2.242	c	2	b	C	d
25	298.15	a	1.810*	c	3	b	A	d
25	298.15	a	1.844	c	3	b	B	d
25	298.15	a	1.847	c	3	b	C	d
30	303.15	a	3.026	c	0	b	A	d
30	303.15	a	3.021	c	0	b	B	d
30	303.15	a	2.861	c	0.2	b	A	d
30	303.15	a	2.674	c	0.5	b	A	d
30	303.15	a	2.588*	c	0.5	b	B	d
30	303.15	a	2.407	c	1	b	A	d
30	303.15	a	2.418	c	1	b	B	d
30	303.15	a	1.971	c	2	b	A	d
30	303.15	a	1.927*	c	2	b	B	d
30	303.15	a	1.965	c	2	b	C	d
30	303.15	a	1.658	c	3	b	A	d
30	303.15	a	1.688*	c	3	b	B	d
30	303.15	a	1.655	c	3	b	C	d
35	308.15	a	2.678	c	0	b	A	d
35	308.15	a	2.553	c	0.2	b	A	d
35	308.15	a	2.388	c	0.5	b	A	d
35	308.15	a	2.108*	c	1	b	A	d
35	308.15	a	2.167	c	1	b	C	d
35	308.15	a	1.763	c	2	b	A	d
35	308.15	a	1.778	c	2	b	C	d
35	308.15	a	1.488	c	3	b	A	d
35	308.15	a	1.488	c	3	b	C	d
40	313.15	a	2.407	c	0	b	A	d
40	313.15	a	2.407	c	0	b	B	d
40	313.15	a	2.289	c	0.2	b	A	d
40	313.15	a	2.141	c	0.5	b	A	d
40	313.15	a	2.188*	c	0.5	b	B	d
40	313.15	a	1.913	c	1	b	A	d
40	313.15	a	1.922	c	1	b	B	d
40	313.15	a	1.566	c	2	b	A	d
40	313.15	a	1.629*	c	2	b	B	d
40	313.15	a	1.5775	c	2	b	C	d
40	313.15	a	1.372*	c	3	b	B	d
40	313.15	a	1.344	c	3	b	C	d
45	318.15	a	2.192	c	0	b	A	d
45	318.15	a	2.084	c	0.2	b	A	d
45	318.15	a	1.955	c	0.5	b	A	d
45	318.15	a	1.752	c	1	b	A	d
45	318.15	a	1.743	c	1	b	C	d
45	318.15	a	1.492	c	2	b	A	d
45	318.15	a	1.441	c	2	b	C	d
45	318.15	a	1.212	c	3	b	A	d
45	318.15	a	1.2116	c	3	b	C	d
50	323.15	a	1.982	c	0	b	A	d
50	323.15	a	1.969	c	0	b	B	d
50	323.15	a	1.897	c	0.2	b	A	d
50	323.15	a	1.753	c	0.5	b	A	d
50	323.15	a	1.765	c	0.5	b	B	d
50	323.15	a	1.597	c	1	b	A	d
50	323.15	a	1.559*	c	1	b	B	d
50	323.15	a	1.317	c	2	b	A	d
50	323.15	a	1.330	c	2	b	B	d
50	323.15	a	1.317	c	2	b	C	d
50	323.15	a	1.093	c	3	b	A	d
50	323.15	a	1.145*	c	3	b	B	d
50	323.15	a	1.099	c	3	b	C	d

Table 2. Smoothed values of (-lg S₁). Deviations (Obs. - Calcd.) (e)
t/°C	Dilution	Ln Kuenen coefficient, S
0	Water	-lg S<1> = 1.1144 (+4)
5	Water	1.1938 (-10)
10	Water	1.2695 (-5)
15	Water	1.3412 (+13)
20	Water	1.40463 (+15)
25	Water	1.4635 (-16)
30	Water	1.5209 (+1)
35	Water	1.5722 (0)
40	Water	1.6200 (+5)
45	Water	1.6593 (-36)
50	Water	1.7053 (+26)
0	0.2 mol/kg	-lg S<1> = 1.1383 (+2)
5	0.2 mol/kg	1.2167 (-14)
10	0.2 mol/kg	1.2920 (-5)
15	0.2 mol/kg	1.3638 (+20)
20	0.2 mol/kg	1.4285 (+25)
25	0.2 mol/kg	1.4842 (+16)
30	0.2 mol/kg	1.5410 (-1)
35	0.2 mol/kg	1.5917 (-3)
40	0.2 mol/kg	1.6393 (+2)
45	0.2 mol/kg	1.6797 (-27)
50	0.2 mol/kg	1.7241 (+22)
0	0.5 mol/kg	-lg S<1> = 1.1738 (0)
5	0.5 mol/kg	1.2510 (-18)
10	0.5 mol/kg	1.3259 (-3)
15	0.5 mol/kg	1.3970 (+25)
20	0.5 mol/kg	1.4605 (+8)
25	0.5 mol/kg	1.5152 (-18)
30	0.5 mol/kg	1.5712 (-3)
35	0.5 mol/kg	1.6210 (-9)
40	0.5 mol/kg	1.6678 (-5)
45	0.5 mol/kg	1.7902 (-19)
50	0.5 mol/kg	1.7523 (+22)
0	1 mol/kg	-lg S<1> = 1.2313 (-4)
5	1 mol/kg	1.3065 (+17)
10	1 mol/kg	1.3800 (-4)
15	1 mol/kg	1.4482 (-20)
20	1 mol/kg	1.5110 (+28)
25	1 mol/kg	1.5645 (-14)
30	1 mol/kg	1.6191 (-2)
35	1 mol/kg	1.6668 (-20)
40	1 mol/kg	1.7140 (-7)
45	1 mol/kg	1.7564 (-5)
50	1 mol/kg	1.7972 (+15)
0	2 mol/kg	-lg S<1> = 1.3365 (-8)
5	2 mol/kg	1.4077 (-14)
10	2 mol/kg	1.4768 (+4)
15	2 mol/kg	1.5422 (+27)
20	2 mol/kg	1.6012 (+25)
25	2 mol/kg	1.6530 (-9)
30	2 mol/kg	1.7055 (-1)
35	2 mol/kg	1.7508 (-31)
40	2 mol/kg	1.7982 (-7)
45	2 mol/kg	1.8404 (-4)
50	2 mol/kg	1.8815 (+18)
0	3 mol/kg	-lg S<1> = 1.4290 (-24)
5	3 mol/kg	1.4980 (-8)
10	3 mol/kg	1.5642 (+17)
15	3 mol/kg	1.6255 (+29)
20	3 mol/kg	1.6822 (+29)
25	3 mol/kg	1.7323 (-8)
30	3 mol/kg	1.7820 (-12)
35	3 mol/kg	1.8280 (-27)
40	3 mol/kg	1.8733 (-21)
45	3 mol/kg	1.9168 (-8)
50	3 mol/kg	1.9602 (+21)

Table 3. Least squared constants of equation (1).
Molality m₂ [mol/kg]	m₂ Note	Equation(s)
0.0	b	A* = 2385.73; D* = 14.0184; C* = 0.0152642
0.2	b	A* = 2347.16; D* = 13.8090; C* = 0.0149259
0.5	b	A* = 2309.60; D* = 13.6316; C* = 0.0146492
1.0	b	A* = 2195.84; D* = 12.9875; C* = 0.0136050
2.0	b	A* = 1912.43; D* = 11.2968; C* = 0.0108268
3.0	b	A* = 1622.96; D* = 9.5253; C* = 0.0078770

Notes:
   Table 1  ^a  Calculated by the compiler.
   Table 1  ^b  m₂ = molality of NaCl.
   Table 1  ^c  S₁ = m₁ / P₁ where m₁ is the molality of CO₂ [mol kg^-1]. The S₁ values are at P₁ = 1 atm.
The starred values were not given as great a weight as the unstarred values in the final graphical estimation of S₁.
   Table 1  ^d  Series A represents the mean of four simultaneous measurements off CO₂ in water. In addition, this series comprises single observations of the solubility in 0.2, 0.5, 1, 2, and 3 mol kg^-1 NaCl solutions.
Series B represents the mean of three experiments at each temperature on each salt concentration recorded.
Series C: the results of series A and B were plotted on a large scale and all results in doubt redetermined.
   Table 2  ^e  Numbers in parentheses represent deviations in fourth decimal place of (-lg S₁).
   Table 3  ^b  m₂ = molality of NaCl.

Method/Apparatus/Procedure:
   The same apparatus and method were used for measurements of solubility and electromotive force. A detailed description of the experimental procedure is available in the source.
Equilibrium in the cell was attained by bubbling CO₂ through the solvent while gently rocking the thermostatted cell. Pressure was maintained constant at 1 atm. The concentration was determined by titrating about 90 cm³ of solution with excess standard Ba(OH)₂ solution and backtitrating the excess.

Source and Purity of Materials:
   (1) From commercial tank. Purity 99.67 % ± 0.05 %.
   (2) 99.98 % pure
   (3) Quality not stated. Degassed by CO₂ bubbling and evacuation.

Estimated Errors:

   Temperature: δS₁ = ± (0.2-0.5) %, while at high temperatures and salt concentrations δS₁ = ± 1 %. (By authors)