IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Erbium formate with Water

Components:
   (1) Erbium formate; Er(CHO2)3; [15331-72-3]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Petrova, E.V.; Portnova, S.M., Zh. Neorg. Khim. 32, 1242-7 (1987).

Variables:
   Temperature = 25 ºC and 50 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

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

Table 1. Solubility values in the Er(CHO₂)₃ - H₂O system at 25 °C.
Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Solid Phase(s)
Liquid phase Er(CHO2)3	25.83	1.15	Er(CHO2)3•2H2O

Table 2. Solubility values in the Er(CHO₂)₃ - H₂O system at 50 °C.
Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Solid Phase(s)
Liquid phase Er(CHO2)3	33.39	1.65	Er(CHO2)3•2H2O

Notes:
   ^a  These values were calculated by the compilers.

Method/Apparatus/Procedure:
   The isothermal method was used. Two weeks were allowed for equilibration. The erbium content was determined complexometrically. The composition of the solid phases was determined by Schreinemakers' method.

Source and Purity of Materials:
   The formate is prepared by the reaction of 85% formic acid with p.a. grade erbium oxide.

Estimated Errors: