Zinc(II) Chloride/Tin(II) Chloride
Zinc chloride is the name of chemical compounds with the formula ZnCl2 and its hydrates. Zinc chlorides, of which nine crystalline forms are known, are colorless or white, and are highly solublein water. ZnCl2itself is hygroscopic and even deliquescent. Samples should therefore be protected from sources of moisture, including the water vapor present in ambient air. Zinc chloride finds wide application in textileprocessing, metallurgical fluxes, and chemical synthesis. No mineral with this chemical composition is known aside from the very rare mineral simonkolleite, Zn5(OH)8Cl2·H2O.
| ZnCl2 | |
| Molar mass | 136.315 g/mol |
| Appearance | white crystalline solid hygroscopic and very deliquescent |
| Odor | odorless |
| Density | 2.907 g/cm3 |
| Melting point | 290 °C (554 °F; 563 K)[1] |
| Boiling point | 732 °C (1,350 °F; 1,005 K)[1] |
| 432.0 g/ 100 g (25 °C) | |
| Solubility | soluble in ethanol, glyceroland acetone |
| Solubility in alcohol | 430.0 g/100ml |
| −65.0·10−6 cm3/mol |
Tin(II) chloride, also known as stannous chloride, is a white crystalline solid with the formula SnCl2. It forms a stable dihydrate, but aqueous solutions tend to undergo hydrolysis, particularly if hot. SnCl2 is widely used as a reducing agent (in acid solution), and in electrolytic baths for tin-plating. Tin(II) chloride should not be confused with the other chloride of tin; tin(IV) chloride or stannic chloride (SnCl4).
| SnCl2 | |
| Molar mass | 189.60 g/mol (anhydrous) 225.63 g/mol (dihydrate) |
| Appearance | White crystalline solid |
| Odor | odorless |
| Density | 3.95 g/cm3 (anhydrous) 2.71 g/cm3 (dihydrate) |
| Melting point | 247 °C (477 °F; 520 K) (anhydrous) 37.7 °C (dihydrate) |
| Boiling point | 623 °C (1,153 °F; 896 K) (decomposes) |
| 83.9 g/100 ml (0 °C) Hydrolyses in hot water |
|
| Solubility | soluble in ethanol, acetone, ether, Tetrahydrofuran insoluble in xylene |
| −69.0·10−6 cm3/mol |