A simplified measurement of hydrated crystal densities of low melting points (low transition points) by solidifications of aqueous solutions.
A volume change method for measuring crystal densities is described. It allows the densities of unstable hydrated crystals at room temperature to be determined, by measurements of volume changes during the solidification of aqueous solutions. NaCl x 2H2O, KCl, MgSO4 x 12H2O and K2HPO4 x 6H2O were measured by the method and their densities (SE) are 1.61+/-0.02, 1.99+/-0.05, 1.45+/-0.01 and 1.75+/-0.02 g ml(-1) respectively. Data of NaCl x 2H2O and KCl are in good agreement with the previously reported values.
Kajiwara
Kazuhito
K
Department of Biosciences, Teikyo University of Science and Technology, Yamanashi, Japan.
Yabe
Kazuyoshi
K
Hashitani
Takusei
T
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D003720:Densitometry; D005615:Freezing; D008278:Magnesium Sulfate / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry; D011189:Potassium Chloride / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions / Q000737:chemistry*; D013816:Thermodynamics
D010710:Phosphates; D017680:Potassium Compounds; D012996:Solutions; D012965:Sodium Chloride; D011189:Potassium Chloride; D008278:Magnesium Sulfate; C013216:potassium phosphate