IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Ammonium sulfate and Water

Components:
   (1) Ammonium sulfate; (NH4)2SO4; [7783-20-2]  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:
   Setchenow, J. [Sechenov, I.M.], Akad. Nauk. SSSR, Mem. Acad. Imp. Sci. St. Petersbourg 1877, 35, 1-59.

Variables:
   Temperature = 291.53 K
   Concentration = c₂/mol dm^-3 = 0 - 1.093

Prepared By:
   Pirketta Scharlin

Experimental Remarks:

   Initial solution: 14.44 g (NH₄)₂SO₄ + water to make 100 cm³ of solution.

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


t/°C	T/K	Temp Note	Dilution	Concentration C₂ [mol/dm³]	Concentration Note	α	α Note	Salt Effect [dm³/mol]	Salt Note
18.38	291.53	a	∞	0	a	0.896	b	-	a, c
18.38	291.53	a	2	0.5464	a	0.711	b	0.184	a, c
18.38	291.53	a	2	0.5464	a	0.713	b	0.182	a, c
18.38	291.53	a	1	1.093	a	0.570	b	0.180	a, c
18.38	291.53	a	1	1.093	a	0.580	b	0.172	a, c

Notes:
   ^a  Calculated by the compiler.
   ^b  α = Bunsen coefficient [cm³ (STP) cm^-3 atm^-1].
   ^c  K_scc = Setchenow salt effect parameter; K_scc = (1/c₂) lg(α^o/α).

Method/Apparatus/Procedure:
   Setchenow (Ref. 1) based his apparatus on those of Fernet (1857) and of Meyer (1857). The manometer was based on ideas he learned from Regnault in 1861. The one meter manometer had three branches, two for measuring the pressure and one a mercury reservoir. The manometer was connected to the absorption cell by a flexible silver capillary. The absorption cell was of two bulbs with a mark in the constricting connection. CO₂ gas was generated, saturated with water vapor and filled the bulbs and manometer to a known pressure less than atmospheric. The liquid was degassed by heating and then passed by the pressure difference into the lower bulb to the mark of known volume. The system was sealed, turned 90 degrees and shaken until equilibrium was established. The gas volume absorbed was reduced to 0 °C and one meter Hg pressure. The Bunsen coefficient was calculated.

Source and Purity of Materials:
   (1) Apparently generated from limestone and sulfuric acid. Dried.
   (2) Not specified.
   (3) Not specified, assumed to be distilled.

Estimated Errors:

   Temperature: The author makes a qualitative statement that the results are good to the second decimal.

References:
   1. Setchenow, J., Akad. Nauk. SSR Mem. Acad. Imp. Sci. St. Petersburg 1887, 35, [Ser. No. 7], 1-59.