Гидроксид стронция химические свойства, назначение, производство
Описание
Strontium Hydroxide occurs as an anhydrate whose prismatic, colorless
crystals are deliquescent. A monohydrate and octahydrate
are also known.Strontium hydroxide is slightly soluble in water but,
surprisingly, the octahydrate is much more soluble. It
is the latter that is supplied commercially for most applications.When the octahydrate is heated, seven waters of
hydration are lost to form the monohydrate and finally the oxide.
Химические свойства
colourless deliquescent crystals
Физические свойства
White deliquescent crystal; density 3.625 g/cm3; melts at 375°C in hydrogen atmosphere; converts to oxide at 710°C; slightly soluble in water at 0°C, 0.41 g/100 mL, soluble in boiling water at 100°C, 21.83 g/100 mL; soluble in acids and ammonium chloride solution.
The octahydrate consists of colorless, tetragonal, deliquescent crystals; density 1.90 g/cm3; loses all its water molecules at 100°C; sparingly soluble in water at low temperatures, 0.90 g/100 mL at 0°C; soluble in boiling water, 47.7 g/100 mL at 100°C; aqueous solution highly alkaline; soluble in acids and in ammonium chloride solution; insoluble in acetone.
Использование
Strontium hydroxide [Sr(OH)2] is used to extract sugar from sugar beet molasses. It is also used in the manufacture of soaps, adhesives, plastics, glass, and lubricants that can be used in very high or low temperature environments.
Подготовка
Preparation Strontium hydroxide is prepared by treating strontium oxide with water: SrO + H2O → Sr(OH)2
Alternatively, Sr(OH)2 is made by heating strontium carbonate or strontium sulfide with steam at temperatures around 500 to 600°C: SrCO3 + H2O → Sr(OH)2 + CO2 SrS + 2H2O → Sr(OH)2 + H2S.
Методы очистки
Crystallise the hydroxide from hot water (2.2mL/g) by cooling to 0o.
Гидроксид стронция препаратная продукция и сырье
сырьё
препарат