ABSTRACT

A pure hydrated potassium borate K2B5O8(OH)*2H2O has been synthesized under mild hydrothermal conditions and characterized by single crystal X-ray diffraction, XRD, FT-IR, Raman spectra and DTA-TG techniques. The crystal structure of K2B5O8(OH)*2H2O consists of two K O polyhedra and [B5O8(OH)]2- polyborate anion. Through designing the thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be ( 4843.1+-4.0) kJ mol 1 by using a heat conduction microcalorimeter.

Compounds

#	Formula	Name
1	ClK	potassium chloride
2	ClH	hydrogen chloride
3	BH3O3	boric acid
4	H2O	water
5	B5H5K2O11	boron potassium hydroxide oxide (B5K2(OH)O8), hydrate (1:2)

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	5	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal	Crystal	X-ray diffraction	1
POMD	2 4 3	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid Pressure, kPa; Liquid Solvent: Amount ratio of component to other component of binary solvent - 4; Liquid	Liquid	Calvet calorimetry	1
RXND	1 2 3 5 4	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Synthesis, characterization and thermochemistry of K2B5O8(OH)*2H2O

Liu, Z.-H.[Zhi-Hong], Li, P.[Ping], Li, L.-Q.[Lian-Qing], Jia, Q.-X.[Qin-Xiang]

ABSTRACT