IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Thorium formate with Different solvents

Components:
   (1) Different solvents; ; []  NIST Chemistry WebBook for detail
   (2) Thorium formate; Th(CHO2)4; [562-99-2]  NIST Chemistry WebBook for detail

Original Measurements:
   Claudel, B.; Mentzen, B., Bull. Soc. Chim.France 5, 1547-1552 (1966).

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).)

Table 1. Solubility of Th(CHO₂)₄•3H₂O in different solvents.
c [mg/L]	Chemical₁	Activity [strikes/min]	Concentration [mg/L]
-	Noise level CARNS	600	-
1000	Etalon CARNS	2930	1000
10.7	Ethylene oxide CARNS	625	10.7
17.2	Acetone CARNS	640	17.2
17.2	Trichloroethylene CARNS	640	17.2
23.6	Ethanol CARNS	1655	23.6
36.5	Benzene CARNS	685	36.5
47.2	Tetrachloromethane CARNS	710	47.2
57.2	Isopropanol CARNS	1735	57.2
137.3	Methanol CARNS	9201	137.3

Table 2. Solubility values in the Th(CHO₂)₄ – H₂O system at 25 °C.
c [mg/L]	Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Solid Phase(s)^b	Concentration [mg/L]
-	Liquid phase Th(CHO2)4	6.73	0.175	Th(CHO2)4•3H2O.	-

Notes:
   ^a  This value was calculated by the compilers.
   ^b  The solid phase is: A= Th(CHO₂)₄•3H₂O.

Method/Apparatus/Procedure:
   The initial nitrate was doped with ²²⁸₉₂Th, in such a way to obtain ~10 μCi/g activity.The Th(CHO₂)₄•3H₂O obtained from this nitrate was put in the contact with different organic solvents in saturated solutions. One mL of each solution was measured for radioactivity for a definite time. One g/L Th(CHO₂)₄•3H₂O was used as standard solution giving 0.01 μCi/mL.

Source and Purity of Materials:
   Thorium formate trihydrate was prepared from a dilute solution of formic acid (40%) and Th(OH) ₄.

Estimated Errors: