Sulfamic acid

Sulfamic acid
Tautomerism of sulfamic acid
Ball-and-stick model of the canonical neutral form
Ball-and-stick model of the canonical neutral form
Ball-and-stick model of the zwitterionic form
Ball-and-stick model of the zwitterionic form
Names
IUPAC name
Sulfamic acid
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.023.835 Edit this at Wikidata
EC Number
  • 226-218-8
25628
RTECS number
  • WO5950000
UNII
UN number 2967
  • InChI=1S/H3NO3S/c1-5(2,3)4/h(H3,1,2,3,4) checkY
    Key: IIACRCGMVDHOTQ-UHFFFAOYSA-N checkY
  • InChI=1/H3NO3S/c1-5(2,3)4/h(H3,1,2,3,4)
    Key: IIACRCGMVDHOTQ-UHFFFAOYAK
Properties
H3NSO3
Molar mass 97.10 g/mol
Appearance white crystals
Density 2.15 g/cm3
Melting point 205 °C (401 °F; 478 K) decomposes
Moderate, with slow hydrolysis
Solubility
  • Moderately soluble in DMF
  • Slightly soluble in MeOH
  • Insoluble in hydrocarbons
Acidity (pKa) 1.0[1]
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H412
P264, P273, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362, P501
Safety data sheet (SDS) ICSC 0328
Related compounds
Other cations
 Ammonium sulfamate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sulfamic acid, also known as amidosulfonic acid, amidosulfuric acid, aminosulfonic acid, sulphamic acid and sulfamidic acid, is a molecular compound with the formula H3NSO3. This colourless, water-soluble compound finds many applications. Sulfamic acid melts at 205 °C before decomposing at higher temperatures to water, sulfur trioxide, sulfur dioxide and nitrogen.[2]

Sulfamic acid (H3NSO3) may be considered an intermediate compound between sulfuric acid (H2SO4), and sulfamide (H4N2SO2), effectively replacing a hydroxyl (–OH) group with an amine (–NH2) group at each step. This pattern can extend no further in either direction without breaking down the sulfonyl (–SO2–) moiety. Sulfamates are derivatives of sulfamic acid.

  1. ^ Candlin, J. P.; Wilkins, R. G. (1960). "828. Sulphur–nitrogen compounds. Part I. The hydrolysis of sulphamate ion in perchloric acid". Journal of the Chemical Society (Resumed): 4236–4241. doi:10.1039/JR9600004236.
  2. ^ Yoshikubo, K.; Suzuki, M. (2000). "Sulfamic Acid and Sulfamates". Kirk-Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1921120625151908.a01. ISBN 0471238961.