IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium formate with Cadmium formate, Barium formate and Water

Components:
   (1) Ammonium formate; NH4CHO2; [540-69-2]  NIST Chemistry WebBook for detail
   (2) Barium formate; Ba(CHO2)2; [541-43-5]  NIST Chemistry WebBook for detail
   (3) Cadmium formate; Cd(CHO2)2; [4464-23-7]  NIST Chemistry WebBook for detail
   (4) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Itkina, L.S.; Nadzharyan, K.A.; Lepeshkov, I.N., Zh. Neorg. Khim. 26, 1086-91 (1981).

Variables:

   Concentration = Composition at 25 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)

Solubility values in the NH₄CHO₂-Cd(CHO₂)₂-Ba(CHO₂)₂-H₂O system at 25 °C.
Chemical₁	Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Chemical₂	Mass Fraction w₂	m₂ [mol kg-1]^a	Chemical₃	Mass Fraction w₃	m₃ [mol kg-1]	Solid Phase(s)^b
NH4CHO2	Liquid	60.53	24.32	Cd(CHO2)2	0.0	0.0	Ba(CHO2)2	0.0	0.0	A
NH4CHO2	Liquid	0.0	0.0	Cd(CHO2)2	14.10	0.811	Ba(CHO2)2	0.0	0.0	B
NH4CHO2	Liquid	0.0	0.0	Cd(CHO2)2	0.0	0.0	Ba(CHO2)2	23.71	1.367	C
NH4CHO2	Liquid	59.08	23.81	Cd(CHO2)2	0.0	0.0	Ba(CHO2)2	1.57	0.175	A+C
NH4CHO2	Liquid	51.24	19.39	Cd(CHO2)2	5.32	0.627	Ba(CHO2)2	1.53	0.161	A+C
NH4CHO2	Liquid	48.90	18.24	Cd(CHO2)2	7.52	0.874	Ba(CHO2)2	1.07	0.111	A+C
NH4CHO2	Liquid	51.80	22.96	Cd(CHO2)2	10.46	1.444	Ba(CHO2)2	1.96	0.241	A+C
NH4CHO2	Liquid	51.45	23.73	Cd(CHO2)2	12.16	1.747	Ba(CHO2)2	2.01	0.257	A+C
NH4CHO2	Liquid	52.50	23.79	Cd(CHO2)2	12.50	1.764	Ba(CHO2)2	0.0	0.0	A+D
NH4CHO2	Liquid	52.43	24.63	Cd(CHO2)2	11.92	1.744	Ba(CHO2)2	1.89	0.246	A+C+D
NH4CHO2	Liquid	21.01	6.403	Cd(CHO2)2	26.95	2.558	Ba(CHO2)2	0.0	0.0	B+D
NH4CHO2	Liquid	22.12	7.039	Cd(CHO2)2	27.69	2.744	Ba(CHO2)2	0.35	0.031	B+D+E
NH4CHO2	Liquid	0.0	0.0	Cd(CHO2)2	12.46	0.738	Ba(CHO2)2	4.17	0.220	B+E
NH4CHO2	Liquid	12.45	2.725	Cd(CHO2)2	14.06	0.959	Ba(CHO2)2	1.05	0.064	B+E
NH4CHO2	Liquid	16.46	3.818	Cd(CHO2)2	14.54	1.051	Ba(CHO2)2	0.64	0.041	B+E
NH4CHO2	Liquid	21.06	5.939	Cd(CHO2)2	22.23	1.953	Ba(CHO2)2	0.48	0.038	B+E
NH4CHO2	Liquid	22.57	6.903	Cd(CHO2)2	24.53	2.337	Ba(CHO2)2	1.05	0.089	B+E
NH4CHO2	Liquid	29.54	9.040	Cd(CHO2)2	18.13	1.728	Ba(CHO2)2	0.51	0.043	D+E
NH4CHO2	Liquid	33.65	10.37	Cd(CHO2)2	14.39	1.381	Ba(CHO2)2	0.49	0.042	D+E
NH4CHO2	Liquid	39.28	13.16	Cd(CHO2)2	12.63	1.318	Ba(CHO2)2	0.74	0.069	D+E
NH4CHO2	Liquid	46.30	18.20	Cd(CHO2)2	11.89	1.456	Ba(CHO2)2	1.46	0.159	C+D+E
NH4CHO2	Liquid	0.0	0.0	Cd(CHO2)2	1.02	0.066	Ba(CHO2)2	22.44	1.289	C+E
NH4CHO2	Liquid	17.06	3.655	Cd(CHO2)2	1.02	0.068	Ba(CHO2)2	7.90	0.469	C+E
NH4CHO2	Liquid	24.94	5.768	Cd(CHO2)2	1.35	0.097	Ba(CHO2)2	5.14	0.330	C+E
NH4CHO2	Liquid	25.52	5.781	Cd(CHO2)2	1.55	0.109	Ba(CHO2)2	2.93	0.184	C+E
NH4CHO2	Liquid	28.16	6.729	Cd(CHO2)2	2.95	0.220	Ba(CHO2)2	2.53	0.168	C+E
NH4CHO2	Liquid	43.96	16.01	Cd(CHO2)2	10.90	1.236	Ba(CHO2)2	1.59	0.161	C+E
NH4CHO2	Liquid	48.40	18.13	Cd(CHO2)2	7.40	0.863	Ba(CHO2)2	1.86	0.193	C
NH4CHO2	Liquid	21.49	5.535	Cd(CHO2)2	16.36	1.312	Ba(CHO2)2	0.58	0.041	E
NH4CHO2	Liquid	25.01	7.658	Cd(CHO2)2	22.44	2.140	Ba(CHO2)2	0.76	0.065	E

Notes:
   ^a  The molality values were calculated by the compilers.
   ^b  The solid phases are: A = NH₄CHO₂; B = Cd(CHO₂)₂•2H₂O; C = Ba(CHO₂)₂; D = NH₄Cd(CHO₂)₃; E = CdBa(CHO₂)₄•2H₂O.

Method/Apparatus/Procedure:
   The isothermal method was used. Equilibrium was reached in 2 weeks. The NH₄⁺ content was determined by the tetraphenylborate method. The cadmium content was determined by complexometric titration using Eriochrome Black T as indicator. The barium content was determined gravimetrically. The composition of the solid phases was determined by Schreinemakers method, by DT analysis, IR spectroscopy and x-ray diffraction.

Source and Purity of Materials:
   Cd(CHO₂)₂•2H₂O was prepared by neutralizing 85% formic acid with p.a. grade CdCO₃. p.a. grade Ba(CHO₂)₂ was used. The barium and cadmium formates were recrystallized twice from a 1% formic acid solution. Ammonium formate was prepared by passing NH₃ into 90% formic acid. The crystals were washed with ethanol and dried under vacuum over sulfuric acid.

Estimated Errors:

   Temperature: The temperature was controlled to within ±0.1 °C.