Calcium thiocyanate is an inorganic compound, a salt of calcium and rhodanic acid with the formula Ca (SCN) 2 , colorless (white) crystals, it dissolves in water, forms crystalline hydrates .
| Calcium thiocyanate | |
|---|---|
| Are common | |
| Systematic name | Calcium thiocyanate |
| Traditional names | Calcium thiocyanate; calcium thiocyanate |
| Chem. formula | Ca (SCN) 2 |
| Rac formula | Ca (SCN) 2 |
| Physical properties | |
| condition | colorless (white) crystals |
| Molar mass | 156.24 g / mol |
| Density | 2.1 g / cm³ |
| Chemical properties | |
| Water solubility | tetrahydrate - 59 g / 100 ml |
| Classification | |
| Reg. CAS number | 65114-14-9 |
| Reg. EINECS number | 218-244-3 |
Content
Getting
- The effect of calcium oxide on ammonium thiocyanate :
Physical Properties
Calcium thiocyanate forms colorless (white) crystals of monoclinic syngony , space group C 2 / c , cell parameters a = 0.9617 nm, b = 0.6424 nm, c = 0.7872 nm, β = 90.82 °, Z = four.
It is soluble in water and ethanol .
It forms crystalline hydrates of the composition Ca (SCN) 2 • n H 2 O, where n = 2, 3, and 4.
Crystalline hydrate Ca (SCN) 2 • 4H 2 O at 23.7 ° С [1] undergoes a phase transition in β-Ca (SCN) 2 • 4H 2 O, melts in its own crystallization water at 42.5–46.5 ° С , at 160 ° C is destroyed.
Crystalline hydrate Ca (SCN) 2 • 2H 2 O forms rhombic syngony crystals, space group P nma , cell parameters a = 1.2801 nm, b = 0.7903 nm, c = 0.7269 nm, Z = 4. [2]
Application
It is used as a mordant for dyeing or stuffing fabrics and as a solvent for cellulose , for mercerizing cotton, in medicine instead of potassium iodide (for treating atherosclerosis ), in the manufacture of parchment .
Notes
- ↑ Kirgintsev A.N., Trushnikova A.N., Lavrentieva V.G. Solubility of inorganic substances in water. - L .: Chemistry, 1972.- 248 p.
- ↑ Claudia Wickleder and Patrick Larsen. Ca (SCN) 2 and Ca (SCN) 2 • 2H 2 O: Crystal Structure, Thermal Behavior and Vibrational Spectroscopy // Z. Naturforsch .. - 2002. - V. 57 b . - S. 1419-1426 .
Literature
- Chemist Handbook / Redkol .: Nikolsky B.P. et al. - 3rd ed., Rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
- CRC Handbook of Chemistry and Physics . - 89th edition. - Taylor and Francis Group, LLC, 2008-2009.