7790-93-4 Usage
Description
Chloric acid, HClO3, is an oxoacid of chloride, and
the formal precursor of chlorate salts. It is a strong
acid (pKa＝-1) and a strong oxidizing agent. It is stable
in cold aqueous solution up to a concentration of
approximately 30%, and solution of up to 40% can be
prepared by careful evaporation under reduced pressure.
Above these concentrations, and on warming,
chloric acid solutions decompose to give a variety of
products, for example:
8HClO3→4HClO4＋2H2O＋2Cl2＋3O2
Note that it disproportionates into perchloric acid
in which the chlorine atom has a＋7 oxidation state
and also the zero oxidation state of chlorine gas (an
oxidation–reduction reaction). Thus, under the proper
conditions, it can also be used to make perchloric acid.
3HClO3→HClO4＋H2O＋2ClO2
Chemical Properties
can occur only in an aqueous solution; oxidizing agent; preparation: reaction between H2SO4 and barium chlorate; used as a catalyst in the polymerization of acrylonitrile, as an oxidizing agent [MER06] [HAW93]
Uses
Oxidizing agent; with H2SO3 as catalyst in acrylonitrile polymerization.
General Description
CHLORIC ACID is a colorless liquid. CHLORIC ACID will accelerate the burning of combustible materials and can ignite most on contact. CHLORIC ACID is corrosive to metals and tissue. CHLORIC ACID is used as a reagent in chemical analysis and to make other chemicals.
Air & Water Reactions
Water soluble.
Reactivity Profile
Self-reactive. Concentrations of CHLORIC ACID above 40% decompose [Mellor 2 Supp. 1:576 1956]. Antimony sulfide and concentrated solutions of CHLORIC ACID react with incandescence [Mellor Supp. II Part I:584 1956]. Arsenic sulfide and concentrated solutions of CHLORIC ACID react with incandescence . Reacts with vigor even explodes with other metal sulfides, i.e. copper sulfide [Mellor Supp. II Part I:584 1956]. In contact with oxidizable materials, including ammonia, reactions can be extremely violent. Filter paper ignites after soaking in CHLORIC ACID, [Mellor, 1946, Vol. 2, 310]. Explosions have been recorded by mixtures of CHLORIC ACID solution with metals such as: antimony, bismuth, and iron. This is due to the formation of explosive compounds including hydrogen.
Hazard
Toxic by ingestion and inhalation. Strong
oxidizer, ignites organic materials on contact.
Safety Profile
A poison. A strong
irritant by ingestion and inhalation.
Dangerous fire hazard; ignites organic
matter upon contact. A very powerful
oxidizing agent. Violent or explosive
reaction with oxidlzable materials. Aqueous
solutions decompose explosively during
evaporation. Solutions greater than 40% are
unstable. Reacts violently with NH3, Sb,
Sb2S3, AsS3， Bi, CuS, PHI4+ SnS2, SnS.
Reaction with cellulose causes ignition after
a delay period. Dangerous reaction with
metal sulfides and metal chlorides (e.g.,
incandescent reaction with antimony
trisulfide, arsenic trisulfide, tin(lI)sulfide,
tin(Iv> sulfide, explosion on contact with
copper sulfide). Reaction with metals (e.g.,
antimony, bismuth, iron) forms explosive
products. When heated to decomposition it
emits toxic fumes of Cl-. See also
CHLORATES and CHLORINE.
Check Digit Verification of cas no
The CAS Registry Mumber 7790-93-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,9 and 0 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 7790-93:
(6*7)+(5*7)+(4*9)+(3*0)+(2*9)+(1*3)=134
134 % 10 = 4
So 7790-93-4 is a valid CAS Registry Number.
InChI:InChI=1/ClHO3/c2-1(3)4/h(H,2,3,4)
7790-93-4Relevant articles and documents
Crystal structure and characterization of L-arginine chlorate and L-arginine bromate
Petrosyan,Karapetyan,Sukiasyan,Aghajanyan,Morgunov,Kravchenko,Bush
, p. 144 - 152 (2007/10/03)
The salts L-arginine.HClO3 and L-arginine.HBrO3, were synthesized. The crystals obtained were characterized by IR and NQR spectroscopy, thermal analysis, Nd:YAG laser radiation second harmonic generation, dielectric, piezoelectric an
Properties of dichlorine hexaoxide in the gas phase and in low-temperature matrices
Jansen, Martin,Schatte, Gabriele,Tobias, Klaus M.,Willner, Helge
, p. 1703 - 1706 (2008/10/08)
The IR spectrum of matrix-isqlated dichlorine hexaoxide shows that there are two inequivalent chlorine atoms in the molecule and that it is best described as the mixed anhydride of chloric and perchloric acids. Of 18 fundamental vibrations, 16 were observed and many of them were assigned. O3ClOClO2 exhibits a broad UV absorption at 268 nm (εmax = 3000 dm3 mol-1 cm-1) in the gas phase. It is decomposed on photolysis in an Ar matrix to ClOClO3 and O2. The kinetics of formation and decomposition of O3ClOClO2 in the gas phase were also investigated. The rate of formation depends strongly on the concentration of ClO2 and O3. Cl2O6 does not dissociate into ClO3 radicals, and the primary stable decomposition products are ClO2, ClOClO3, and O2.
ETUDE ET CARACTERISATION PAR SPECTROMETRIE INFRAROUGE DES OXYDES DE CHLORE, (ClO)2, ClO2, Cl2O4 et Cl2O3, FORMES DANS LES INTERACTIONS CHLORE-OZONE
Loupec, R. C.,Potier, J.
, p. 449 - 454 (2007/10/02)
The non photochemical reaction of (O2 + O3) (9) with Cl2 (1) at -78, -44, -40 deg C essentially gives chlorine chlorate which is characterized by ν(ClOCl) at 785 and 745 cm-1.Water traces lead to ClO2 but also to HClO3, HCl and to small quantities of other chlorine oxydes by a water catalyzed process.In the darkness and in the gas phase (p = 3 atm and t = 15 deg C) pure ozone reacts with chlorine and gives a ClO2 rich mixture containing also a high proportion of chlorine clorate with chlorine perchlorate traces; chlorine chlorate is characterized by νs(ClO2) = 1015 cm-1 νas(ClO2) = 1280 cm-1 and the two bridge vibrations νClOCl at 735 and 695 cm-1.Reactional mechanisms are proposed.Keywords: Ozone chlorine, chlorine chlorite, chlorine chlorate, chlorine perchlorate, chloric acid, I.R. spectroscopy.
