IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Copper(II) formate with Water

Components:
   (1) Copper(II) formate; Cu(CHO2)2; [544-19-4]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Gauthier, J., Thèses faculté des sciences de l'université de Paris, 65-71 (1958).

Variables:
   Temperature = range of -0.595 ºC to 64 ºC

Prepared By:
   Chr.Balarew

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

Solubility polytherm of the Cu(CHO₂)₂- H₂O system
t/°C	Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Solid Phase(s)^b
-0.155	Liquid	0.59	0.0386	Ice
-0.275	Liquid	1.19	0.0784	Ice
-0.285	Liquid	1.27	0.0840	Ice
-0.345	Liquid	1.52	0.1003	Ice
-0.375	Liquid	1.71	0.1131	Ice
-0.445	Liquid	2.07	0.1378	Ice
-0.505	Liquid	2.41	0.1610	Ice
-0.515	Liquid	2.44	0.1630	Ice
-0.555	Liquid	2.71	0.1814	Ice
-0.585	Liquid	2.86	0.1914	ice+A
-0.57	Liquid	2.92	0.1956	ice+A
-0.595	Liquid	2.96	0.1988	-
0	Liquid	2.97	0.1996	A
10	Liquid	4.63	0.3162	A
15	Liquid	6.07	0.4206	A
20	Liquid	7.32	0.5141	A
25	Liquid	9.92	0.7172	A
30	Liquid	11.73	0.8652	A
35	Liquid	16.64	1.3000	A
56	Liquid	24.67	2.132	B
64	Liquid	31.12	2.942	B

Notes:
   ^a  These values were calculated by the compiler.
   ^b  The solid phases are: A = Cu(CHO₂)₂•4H₂O, B = Cu(CHO₂)₂•2H₂O.

Method/Apparatus/Procedure:
   It appears that the isothermal method was used. Above 0°C a Dewar flask with a Robertean thermometer graduated in 0.01 °C was used. Below 0 °C a mixture of water and salt was used to cool a jacket containing acetone or methanol. The copper content was determined electrolytically.

Source and Purity of Materials:
   Distilled water was used.

Estimated Errors:
   Solubility: ±0.07 mass % (from the eutectic point).