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-chloride-3D-balls-1000x1000.png "Cobalt (II) Chloride (chemical)")
2g of CoCl2.6H2O. Caution: harmful if swallowed. Appropriate quantity as a replacement for chemistry set chemical. Image for illustration only, actual product may appear different.
Cobalt(II) chloride is the chemical compound with the formula CoCl2, although the term is used also to refer to the hexahydrate, which is a different chemical compound. CoCl2 is blue, and CoCl2·6H2O is deep rose. Because of this dramatic color change and the ease of the hydration/dehydration reaction, "cobalt chloride" is used as an indicator for water.[1] The rose hexahydrate is one of the most common cobalt compounds in the laboratory.
Image & text from Wikipedia.
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