NIST Standard Reference Database 106

Solubility System:

**Carbon dioxide with Ammonium chloride, Sodium chloride, Potassium chloride and Water**

**Components:**

(1) Ammonium chloride; Sodium chloride; Potassium chloride; ; [] 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:**

Mackenzie, J. J., Ann. Phys. (Leipzig) [3] 1877, 1, 438-51.

**Variables:**

Temperature = 279.6 K to 295.2 K

Pressure = 279.6 K to 295.2 K

**Prepared By:**

H.L. Clever

**Experimental Remarks:**

For ammonium chloride at 288 K and 8.723 mass % the paper gave an average solubility of 0.7906. The compiler's average of 0.7973 is given in the table.

The relative density of 22.506 mass % KCl must be a printing error. Comparison with density values in the

*International Critical Tables*leads one to assume the value should be 1.149. The concentration is calculated with the assumption.

The compiler calculated and added the Kelvin temperatures, the concentration and molality values and the standard deviations.

For values of large standard deviation the compiler has dropped the value with largest deviation and given a second average.

These data are of marginal value. Some show a standard deviation as large as 10 %, although many show a standard deviation under 3 %.

The author clearly states these are Bunsen coefficients. However, the compiler's analysis of the author's calculation indicates the gas volume was reduced to the partial pressure at equilibrium. If this is true the values need to be reduced from 0 to 7.5 % to the Bunsen coefficients.

Tabulated in the paper are pressure and volume of dry gas before equilibration, volume and partial pressure of wet CO

_{2}gas not absorbed, and mercury volume displaced.

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

t/°C | T/K | Density ρ | Density Note | Concentration C_{2} [mol/L] | Concentration Note | Mass Fraction (w_{2}) | w2 Note | α | α Note | Molality m_{2} [mol/kg] | m_{2} Note |
---|---|---|---|---|---|---|---|---|---|---|---|

8 | 281 | 1.021 | b | 1.234 | c | 6.465 | a | 1.0227 ± 0.0007 (2) | e | 1.292 | d |

8 | 281 | 1.047 | b | 1.707 | c | 8.723 | a | 1.0000 ± 0.0000 (2) | e | 1.787 | d |

8 | 281 | 1.053 | b | 2.505 | c | 12.727 | a | 0.9220 ± 0.0023 (2) | e | 2.726 | d |

10 | 283 | 1.072 | b | 4.857 | c | 24.233 | a | 0.8132 ± 0.0106 (3) | e | 5.979 | d |

15 | 288 | 1.021 | b | 1.234 | c | 6.465 | a | 0.8253 ± 0.0106 (3) | e | 1.292 | d |

15 | 288 | 1.047 | b | 1.707 | c | 8.723 | a | 0.7973 ± 0.0115 (3) | e | 1.787 | d |

15 | 288 | 1.053 | b | 2.505 | c | 12.727 | a | 0.7981 ± 0.0129 (3) | e | 2.726 | d |

15 | 288 | 1.072 | b | 4.857 | c | 24.233 | a | 0.7384 ± 0.0146 (2) | e | 5.979 | d |

22 | 295 | 1.021 | b | 1.234 | c | 6.465 | a | 0.7182 ± 0.0040 (2) | e | 1.292 | d |

22 | 295 | 1.047 | b | 1.707 | c | 8.723 | a | 0.7022 ± 0.0122 (2) | e | 1.787 | d |

22 | 295 | 1.053 | b | 2.707 | c | 12.727 | a | 0.6840 ± 0.0203 (3) or 0.6958 ± 0.0017 (2) | e | 2.726 | d |

22 | 295 | 1.053 | b | 4.857 | c | 24.333 | a | 0.5998 ± 0.0172 (3) | e | 5.979 | d |

t/°C | T/K | Density ρ | Density Note | Concentration C_{2} [mol/L] | Concentration Note | Mass Fraction (w_{2}) | w2 Note | α | α Note | Molality m_{2} [mol/kg] | m_{2} Note |
---|---|---|---|---|---|---|---|---|---|---|---|

6.4 | 279.6 | 1.038 | b | 1.254 | c | 7.062 | a | 0.8990 ± 0.0402 (4) | e | 1.300 | d |

6.4 | 279.6 | 1.080 | b | 2.402 | c | 12.995 | a | 0.6326 ± 0.0181 (4) | e | 2.565 | d |

6.4 | 279.6 | 1.123 | b | 3.347 | c | 17.42 | a | 0.5181 ± 0.0319 (3) or 0.4998 ± 0.0045 (2) | e | 3.610 | d |

6.4 | 279.6 | 1.195 | b | 5.317 | c | 26.00 | a | 0.3470 ± 0.0314 (3) or 0.3649 ± 0.0064 (2) | e | 6.012 | d |

15 | 288 | 1.038 | b | 1.254 | c | 7.062 | a | 0.7347 ± 0.0186 (3) | e | 1.300 | d |

15 | 288 | 1.080 | b | 2.402 | c | 12.995 | a | 0.5569 ± 0.0057 (2) | e | 2.565 | d |

15 | 288 | 1.123 | b | 3.347 | c | 17.42 | a | 0.4306 ± 0.0101 (3) | e | 3.610 | d |

15 | 288 | 1.195 | b | 5.317 | c | 26.00 | a | 0.2969 ± 0.0168 (3) | e | 6.012 | d |

22 | 295 | 1.080 | b | 2.402 | c | 12.995 | a | 0.4822 ± 0.0104 (2) | e | 2.565 | d |

22 | 295 | 1.123 | b | 3.347 | c | 17.42 | a | 0.3892 ± 0.0084 (3) | e | 3.610 | d |

22 | 295 | 1.195 | b | 5.317 | c | 26.00 | a | 0.2630 ± 0.0192 (3) or 0.2741 ± 0.0020 (2) | e | 6.012 | d |

t/°C | T/K | Density ρ | Density Note | Concentration C_{2} [mol/L] | Concentration Note | Mass Fraction (w_{2}) | w2 Note | α | α Note | Molality m_{2} [mol/kg] | m_{2} Note |
---|---|---|---|---|---|---|---|---|---|---|---|

8 | 281 | 1.021 | b | 0.828 | c | 6.0548 | a | 0.9880 ± 0.0004 (2) | e | 0.864 | d |

8 | 281 | 1.053 | b | 1.221 | c | 8.6460 | a | 0.9178 ± 0.0116 (3) | e | 1.269 | d |

8 | 281 | 1.080 | b | 1.734 | c | 11.974 | a | 0.8639 ± 0.0056 (3) | e | 1.824 | d |

8 | 281 | 1.549 ? | b | (3.468) | c | 22.506 | a | 0.6877 ± 0.0107 (3) | e | 3.895 | d |

15 | 288 | 1.021 | b | 0.864 | c | 6.0548 | a | 0.7772 ± 0.0282 (3) or 0.7935 ± 0.0033 (2) | e | 0.864 | d |

15 | 288 | 1.053 | b | 1.269 | c | 8.6460 | a | 0.7768 ± 0.0107 (3) | e | 1.269 | d |

15 | 288 | 1.080 | b | 1.824 | c | 11.974 | a | 0.7202 ± 0.0085 (3) | e | 1.824 | d |

15 | 288 | 1.549 ? | b | 3.895 | c | 22.506 | a | 0.5707 ± 0.0091 (3) | e | 3.895 | d |

22 | 295 | 1.021 | b | 0.864 | c | 6.0548 | a | 0.6701 ± 0.0225 (3) or 0.6820 ± 0.0091 (2) | e | 0.864 | d |

22 | 295 | 1.053 | b | 1.269 | c | 8.6460 | a | 0.6488 ± 0.0269 (3) or 0.6339 ± 0.0105 (2) | e | 1.269 | d |

22 | 295 | 1.080 | b | 1.824 | c | 11.974 | a | 0.5970 ± 0.0087 (3) or 0.5832 ± 0.0008 (2) | e | 1.824 | d |

22 | 295 | 1.549 ? | b | 3.895 | c | 22.506 | a | 0.4801 ± 0.0239 (3) | e | 3.895 | d |

**Notes:**

^{a}

*w*

_{2}=mass fraction of salt

^{b}

*d*

^{15}

_{15}= relative density

^{c}

*c*

_{2}= concentration of salt

^{d}

*m*

_{2}= molality of salt

^{e}α = Bunsen coefficient [cm

^{3}(STP) cm

^{-3}atm

^{-1}].

**Method/Apparatus/Procedure:**

The apparatus consisted of a bulb of known volume in which the initial pressure and carbon dioxide (reduced to 0°C) was measured; a bulb of known volume for the solvent; and a manometer system to adjust the final volume of the unabsorbed wet gas and measure its total pressure (reduced to 0 °C). The final total pressure of wet gas was reduced to the partial pressure of carbon dioxide by subtraction of the solution water vapor pressure.

There was a statement that the carbon dioxide solubility in water was measured, but no solubility values were given.

**Source and Purity of Materials:**

(1) Carbon dioxide. Prepared by action of sulfuric acid on marble. Dried by bubbling through sulfuric acid.

(2) Salts. Recrystallized. Solution prepared by weight and checked by evaporation to dry salt.

(3) Water. Nothing specified.

**Estimated Errors:**

Solubility: Nothing specified, but see standard deviations in table.

Temperature: Nothing specified.