IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Heptane with Water
Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Heptane; C7H16; [142-82-5]  NIST Chemistry WebBook for detail
Original Measurements:
   Schatzberg, P., J. Phys. Chem. 1963, 67, 776-9.

 Variables:
   Temperature = One temperature: 25 °C

 Prepared By:
   M.C. Haulait-Pirson

 Experimental Remarks:
   The solubility of water in heptane at 25°C was reported to be 91 mg(2)/kg sln corresponding to a mole fraction, x2, of 5.06 x 10-4 and to a mass percent of 0.0091 g(1)/100 g sln.

 Experimental Data:   (Notes on the Nomenclature)
   Method/Apparatus/Procedure:
   (1) was saturated by storing over a layer of (2) in a brown glass bottle without any agitation. The bottle was sealed with serum cap and completely submerged in the water-bath for 7 days. A 20 mL sample was withdrawn with a silicone-hydrophobized hypodermic syringe. Stabilized Karl Fischer reagent diluted to a titer of 1.0-1.3 mg(2)/mL was used to titrate (2) in (1) directly in the presence of methanol to a "dead-stop" end-point using a Beckman KF3 automatic titrimeter.

 Source and Purity of Materials:
   (1) Eastman Organic Chemicals; doubly distilled; passed repeatedly through a column of silica gel until no absorption occurred in the 220 to 340 nm spectral range.
   (2) distilled and deionized.

 Estimated Errors:
   Solubility: 0-6% 9deviation from the mean)
   Temperature: ± 0.02 K