The common tetragonal hexahydrate crystallizes from aqueous solution between 30.7 and 53.8 �C . Below these temperatures, a heptahydrate crystallises, and above these temperatures an orthorhombic hexahydrate forms.
2.
It is a white hygroscopic solid; it rapidly absorbs water on exposure to moist air to form a hydrate, which appears to be of variable composition, though the heptahydrate CeCl 3 ? H 2 O is known.
3.
Black bean paste is made from pulverized mung beans, combined with potassium chlorate, ferrous sulfate heptahydrate ( ) crystal ( which in Indonesia is known as " tawas hijau ", or " green crystal " ), or black food colouring.
4.
The term " hydrated sodium carbonate " is commonly used to encompass the monohydrate ( Na 2 CO 3 "'?"'H 2 O ), the decahydrate and the heptahydrate ( Na 2 CO 3 "'?"'7H 2 O ), but is often used in industry to refer to the decahydrate only.
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