Hydroxylammonium chloride
 Hydroxylamine HCl crystals
| |
| Names | |
|---|---|
| IUPAC name
Hydroxylammonium chloride
| |
| Other names
Hydroxyazanium chloride
Hydroxylamine chloride Hydroxylamine HCl Hydroxylamine hydrochloride Hydroxylammoniumchloride | |
| Properties | |
| H4NOCl [NH3OH]Cl NH2OH·HCl | |
| Molar mass | 69.49 g/mol |
| Appearance | White solid |
| Odor | Odorless |
| Density | 1.67 g/cm3 (20 °C) |
| Melting point | 154–156 °C (309–313 °F; 427–429 K) (decomposition) |
| 94 g/100 ml (25 °C) | |
| Solubility | Insoluble in hydrocarbons |
| Solubility in ethanol | 4.43 g/100 ml (20 °C)[1] |
| Solubility in methanol | 16.1 g/100 ml (20 °C)[2] |
| Hazards | |
| Safety data sheet | Sigma-Aldrich |
| Lethal dose or concentration (LD, LC): | |
| LD50 (Median dose)
|
642 mg/kg (rat, oral) |
| Related compounds | |
| Related compounds
|
Hydroxylammonium nitrate Hydroxylammonium perchlorate Hydroxylammonium sulfate |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Hydroxylammonium chloride or hydroxylamine hydrochloride ([NH3OH]Cl) is the hydrochloric acid salt of hydroxylamine.
Contents
Properties
Chemical
Hydroxylamine hydrochloride reacts with ketones to form oximes.
Heating hydroxylamine hydrochloride with sodium nitrite yields nitrous oxide.[3]
- NH2OH·HCl + NaNO2 → N2O + NaCl + 2 H2O
Physical
Hydroxylammonium chloride is a white solid, very soluble in water.
Availability
Hydroxylammonium chloride is sold by lab suppliers.
Preparation
Hydroxylammonium chloride can be prepared by reducing acidified potassium nitrite (aka nitrous acid) with potassium bisulfite, which yields hydroxylammonium sulfate. To obtain the chloride, barium chloride is added.[4] An intermediate in this reaction is potassium hydroxylammonium disulfonate, which has a poor solubility in water (the sodium salt has a high solubility). Despite this it has been mentioned that often precipitation is very delayed and slow.[5] The intermediate hydroxylammonium disulfonate (or rather the monosulfonate produced by hydrolysis in water) can be used directly to prepare oximes,[6] from which hydroxylamine can be regenerated.[7] It should be noted that the acetone oxime prepared in the cited procedure is quite volatile. Apart from steam distillation it can be also extracted into diethyl ether, but this only works for a neutral solution and no oxime is extracted at acidic or basic pH.[8] The literature also reports a preparation of acetone oxime by the reduction of an acetone/sodium nitrite solution with zinc dust.[9]
Hydroxylamine hydrochloride can also be made by heating nitromethane with concentrated hydrochloric acid:[10]
- CH3NO2 + HCl → NH2OH·HCl + 2 H2O + CO
Higher nitroalkanes react in a similar fashion.[11]
This reaction is possible to do with the nitromethane/methanol azeotrope, however the yields are considerably lower.[12]
There are reports in the literature about the electrolytic reduction of nitric acid on various cathodes including lead, tin, with and without amalgamation.[13]
The reduction of ethyl nitrate using tin(II) chloride in hydrochloric acid also yields hydroxylammonium chloride, but separation from the tin solution is somewhat difficult, not to mention the dangers of working with highly explosive ethyl nitrate.[14]
Projects
- Preparation of oximes and hydroxamic acids
- Make nitrous oxide
- Make glyoxime/diacetyldioxime and its red nickel complex
Handling
Safety
Hydroxylammonium chloride is an irritant to the respiratory tract, skin, eyes, and other mucous membranes. It is harmful if swallowed and may be absorbed through the skin. Hydroxylamine and its compounds are considered possible mutagen.
Storage
Hydroxylammonium chloride should be kept in closed plastic bottles, in a cool and safe place.
Hydroxylamine hydrochloride is stable up to 60 °C, above this temperature there will be significant degradation.[15]
Disposal
Hydroxylamine hydrochloride can be neutralized by using a ketone and then gently heating the resulting oxime, which reforms the ketone and releases nitrogen gas and water. It can also be neutralized by diluting it with water and carefully adding ferric salts or other compounds known to accelerate its decomposition.
Reduction of hydroxylamine with Zn/HCl yields ammonia.
Gallery
Very large crystals of slightly discolored hydroxylamine hydrochloride
Microscopic view of the crystals, horizontal view window is about 3 mm
References
- ↑ Lobry de Bruyn, C. A.; Rec. Trav. chim.; vol. 10; (1891); p. 102
- ↑ Lobry de Bruyn, C. A.; Rec. Trav. chim.; vol. 10; (1891); p. 102
- ↑ https://www.youtube.com/watch?v=uzSe3BDCkF8
- ↑ https://www.prepchem.com/synthesis-of-hydroxylamine-hydrochloride/
- ↑ F. Raschig, Ber. Dtsch. Chem. Ges., 1907, 40(4), 4580-4588, doi.org/10.1002/cber.190704004106
- ↑ W. L. Semon, V. R. Damerell, J. Am. Chem. Soc., 1924, 46, 5, 1290–1293, doi.org/10.1021/ja01670a023
- ↑ Waldo L. Semon, Org. Synth., 1923, 3, 61, doi.org/10.15227/orgsyn.003.0061
- ↑ A. Janny, Ber. Dtsch. Chem. Ges., 1882, 15(2), 2778-2783, doi.org/10.1002/cber.188201502255
- ↑ A. Ogata, S. Hirano, Yakugaku Zasshi-journal of The Pharmaceutical Society of Japan, 1930, 50(6), 555-559, doi.org/10.1248/YAKUSHI1881.50.6_555
- ↑ Axt, Glyoxime, Diaminofurazan and some Energetic Derivatives, sciencemadness publication, available here
- ↑ R. B. Cundall, A. W. Locke, J. Chem. Soc. B, 1968, 98-103, doi.org/10.1039/J29680000098
- ↑ Henry, personal experience. Yield for hydrolysis was 29%
- ↑ J. Tafel, Z. Anorg. Chem., 1902, 31(1), 289-325. doi.org/10.1002/zaac.19020310135
- ↑ O. F. v. Dumreicher, Monatshefte für Chemie, 1880, 1, 724–754 doi.org/10.1007/BF01517102
- ↑ L. O. Cisneros, W. J. Rogers, M. S. Mannan, Thermochimica Acta, 2004, 414(2), 177-183, doi.org/10.1016/j.tca.2003.09.023
