IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: 1,10-Phenanthroline with Ethanol and Water
Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Ethanol; C2H6O; [64-17-5]  NIST Chemistry WebBook for detail
   (3) 1,10-Phenanthroline; C12H8N2; [5144-89-8]  NIST Chemistry WebBook for detail
Original Measurements:
   Bhattacharyya, A.K.; Sengupta, D.; Lahiri, S.C., Z. Phys. Chem. Leipzig 1984, 265, 372-378.

 Variables:
   Temperature = 295 K
   Concentration = Solvent composition

 Prepared By:
   W.E. Acree, Jr.

 Experimental Data:   (Notes on the Nomenclature)
  
t/°CConcentration c1 [mol dm**-3]Mole Fraction x2
22.00.01700.000
22.00.04390.033
22.00.10400.071
22.00.34970.117
22.01.01170.170
22.02.27000.235
22.03.95850.325
22.06.81920.418
22.012.62050.553
 Notes:
   a  x2(s): initial mole fraction of binary solvent mixture; c1: solubility of the solute expressed in terms of molarity. Equilibrium solid phase is probably a hydrated form of 1, 10-phenanthroline, particularly in the water-rich binary solvent mixtures.

 Method/Apparatus/Procedure:
   Constant temperature bath, and an ultraviolet/visable spectrophotometer.
Binary solvent mixtures prepared volumetrically and solvent weight percentages calculated from known densities of the pure solvents at 295 K. Excess solute and solvent allowed to equilibrate for 24 hours in a campbell solubility apparatus. Saturated solutions were filtered and withdrawn by inversion of the apparatus. Concentrations determined  spectrophotometrically at 280 nm.

 Source and Purity of Materials:
   (1) Reagent grade, E. Merck, was used as received from chemical supplier.
   (2) Absolute, chemical supplier not specified in paper, was dried over calcium oxide and distilled before use.
   (3) Purity and chemical source not specified in paper.

 Estimated Errors:

   Temperature: T/K: ± precision 0.1 (compiler). x2: ± 0.001 (compiler). c1: ± 3 % (relative error; compiler).