Chemicals

Top

General Information

Copper Sulfate

The mineral form of copper sulfate is chalcanthite. White copper sulfate is copper sulfate without water in its crystal structure (the pentahydrate group). This can be used as an indicator for the presence of water. White copper sulfate turns blauw when it gets into contact with water.

Copper sulfate is instabel, because the water from its crystal structure has the tendency to dissolve the copper sulfate around it. This way the copper sulfate crystals will slowly loose their shape and will eventually pulverize.[1]

Top

Chemical & Physical Information

Trivial nameCopper Sulfate
Chemical nameCopper(II) sulfate, pentahydrate
Other namesBlue vitriol (EN), koper sulfaat (NL,BE)
Type of chemicalIonic compound (salt)
Chemical formulaCuSO4, 5H2O
CAS number7758-98-7 (anhydrous)
7758-99-8 (pentahydrate)
Density3.603 g·cm-3 (anhydrous)
2.284 g·cm-3 (pentahydrate)
Molar mass159.61 g·mol-1 (anhydrous)
249.684 g·mol-1 (pentahydrate)
Melting point650 °C with decomposition, otherwise 110 °C
Boiling pointn/a
SolubleIn water
Solubility (water, 20 °C)390 g·L-1 Copper sulfate solubility graph. (anhydrous)
Crystal systemTriclinic
AppearanceWhite-gray powder (anhydrous)
Blue crystalline solid (pentahydrate)
ColourBlue
Safety summaryToxic, harmful for the environment
Safety dataMSDS
StorageDry
Extra-

For more information, also look at the copper sulfate crystals and the copper sulfate minerals.

Top

Photos

Copper Sulfate

(3 cm)

Top

Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.

[3] Mullin J.W. - Crystallization, 2001