Antimonic acids

Antimony trioxide is insoluble in organic solvents and only very slightly soluble in water. The compound does form a number of hydrates of indefinite composition which are related to the hypothetical antimonic(III) acid (antimonous acid). In acidic solution antimony trioxide dissolves to form a complex series of polyantimonic(III) acids freshly precipitated antimony trioxide dissolves in strongly basic solutions with the formation of the antimonate ion [29872-00-2] Sb(OH) , as well as more complex species. Addition of suitable metal ions to these solutions permits formation of salts. Other derivatives are made by heating antimony trioxide with appropriate metal oxides or carbonates. 

Antimonic acid has been used as an ion-exchange material for a number of cations in acidic solution. Most interesting is the selective retention of Na" in 12 Af HQ, the retention being 99.9% (24). At lower acidities other cations are retained, even K". Many oxidation and polymerization catalysts are listed as containing Sb203. 

At least four series of periodates are known, interconnected in aqueous solutions by a complex series of equilibria involving deprotonation, dehydration and aggregation of the parent acid H5IO6 — cf. telluric acids (p. 782) and antimonic acids (p. 577) in the immediately preceding groups. Nomenclature is summarized in Table 17.24, though not all of the fully protonated acids have been isolated in the free state. The structural relationship between these acids, obtained mainly from X-ray studies on their salts, are shown in Fig. 17.24. H5IO6 itself (mp 128.5° decomp) consists of molecules of (HO)sIO linked into a three-dimensional array by O-H - O bonds (10 for each molecule, 260-278 pm). 

Antimon-saure, /. antimonic acid, -saureanhy-drid, n. antimonic anhydride, antimony pent-oxide. -silber, n. antimonial silver, dyscrasite. -silberblende,/. pyrargyrite. -silberglanz, m. stephanite. -spiegel, m. antimony mirror, -sulfid, n. antimony sulfide, specif, antimony pentasulfide, antimony(V) sulfide, -sulfiir, n. antimony trisulfide, antimony(III) sulfide, -yerblndung,/. antimony compound, -wasser--stoff, m. antimony hydride, stibine. -weiss, n. antimony white (Sb Oa). -zinnober, m. kermes mineral. 

Antimonate, hexafluoro-, 3, 276 Antimonate, tris(cthyl dithioearbonate)-electron pair, 1, 37 Antimonates, 3, 265 Antimonic acids, 3, 265 Antimony, 3, 237-294 biology, 3,277 carcinogenicity, 3, 278 coordination number, 3, 256 determination... 

The reason for such a behaviour of arsenic acid is that arsenic is a member of the group 5A elements in the periodic table. Phosphorus and antimony are also group 5 elements and are known to be chemically similar to arsenic. On this basis [8,9], the antimonic acids were found to be poor cassiterite collectors. The alkyl phosphonic acids were not selective collectors. The ethylphenylene phosphonic acid was found to produce similar or better results compared to /7-tolyl arsonic acid. The structural formula for phosphonic acid (Figure 21.5) is similar to that of /7-tolyl arsonic acid but arsenic was replaced with phosphoms. The styrene phosphonic acid radicals are C6H5-CH-CH and p-ethylphenylene CH3-CH2-C6H4. 

Antimonic acid, 3 59, 65 Antimonin (stibabenzene), 3 72 Antimonious acid, 3 43 Antimonite, 3 43... 

Oi T, Odagiri T, Nomura M (1997) Extraction of lithium from GSJ rock reference samples and determination of their lithium isotopic compositions. Anal Chim Acta 340 221-225 Oi T, Shimizu K, Tayama S, Matsuno Y, Hosoe M (1999) Cubic antimonic acid as column-packing material for chromatographic lithium isotope separation. Sep Sci Tech 34 805-816 Olsher U, Izatt RM, Bradshaw JS, Dailey NK (1991) Coordination chemistry of lithium ion a crystal and molecular structure review. Chem Rev 91 137-164... 

Formula 86205 MW 323.50 always occurs in hydrated form, 86205 nH20 commercial product is either hydrated 86205 or -86204 8ynonyms antimony(V) oxide antimonic acid (hydrated oxide)... 

Antimonic acid is poorly characterized and reported examples me hydrated Sb205 of unknown structure. It is known in its salts, however, and these me of the two main types, based on either [Sb(OH)6] or [SbOe]" octahedra. The oxyions, e.g. [Sb04]3-, do not exist per se. 

It has been reported (4,5) that solid electrolyte sensors using stabilized zirconia can detect reducible gases in ambient atmosphere by making use of an anomalous EMF which is unusually larger than is expected from the Nernst equation. However, these sensors should be operated in a temperature range above ca. 300°C mainly because the ionic conductivity of stabilized zirconia is too small at lower temperatures. On the other hand, solid state proton conductors such as antimonic acid (6,1), zirconium phosphate (8), and dodecamolybdo-phosphoric acid (9) are known to exhibit relatively high protonic conductivities at room temperature. We recently found that the electrochemical cell using these proton conductors could detect... 

Figure 2 shows the structure of this sensor which is similar to that of the potentiometric sensor reported earlier (10). The only difference is that in this sensor a short circuit current between the sensing electrode and the counter electrode is measured with an ammeter. The proton conductor, antimonic acid (Sb205 2H20), was prepared from antimony trioxide and hydrogen peroxide according to a method described elsewhere (7,14). The sample powder was mixed with... 

Modification of the sensor structure. The above amperometric sensor has a rather complicated construction, because the sample gas (H2 + air) is separated from the reference air. So, we tried to simplify the sensor structure as shown in Figure 9. As proton conductor we used a thin antimonic acid membrane (mixed with Teflon powder) of 0.2 mm thickness. This membrane is thin and porous enough to allow a part of the sample gas to permeate. On the other hand, the counter Pt electrode was covered with Teflon and Epoxy resin in order to avoid a direct contact with the sample gas. 

Phosphoric, Vanadic, Arsenic, and Antimonic Acids —Nitrous, Phosphorous, Arsenious Acids—Phos-phatic Acid—Iiyponitrous and Hypophosphorous Acids, and their Saits. 

Water White precipitate of basic salts, and ultimately antimonic acid,... 

Water white precipitate of basic salts with various compositions ultimately antimonic acid is formed ... 

Ammonium antimonates.—On heating antimonic acid with ammonium hydroxide, ammonium meta-antimonate, NH4Sb03,2H20, is precipitated in the form of a powder.2 Secondary ammonium pyro-antimonate, (NH4)aH2Sb207, is also said to have been prepared.8... 

SYNS ANTIMONY LACTATE. soUd (DOT) LACTIC ACID, ANTIMONY SALT PROPANOIC ACID, 2-HYDROXY-, TRIANHYDRIDE with ANTIMONIC ACID (H3Sb03) (9CI)... 

SYNS ANTIMONIC ACID 0 ANTIMONIC OXIDE ANTIMONT PENTAOXIDE DIANTIMONY PENTOXIDE STIBIC ANHYDRIDE... 

SYNS ACETIC ACID, TRIANHYDRIDE with ANTIMONIC ACID ANTIMONY(III) ACETATE OCTAN ANTIMONITY (CZECH)... 

SYN 1,3-PROPANEDIOL, 2-(HYDROXYMETHYL)-2-PROPYI--, CYCLIC ESTER with ANTIMONIC ACID... 

ACETIC ACID PHENYLMETHYL ESTER see BDXOOO ACETIC ACID-2-PROPENYL ESTER see AFU750 ACETIC ACID, n-PROPYL ESTER see PNC250 ACETIC ACID, S.3MARIUM SALT see SAROOO ACETIC ACID, SODIUM SALT see SEG500 ACETIC ACID, TRIANHYDRIDE with ANTIMONIC ACID see AQJ750... 

ANTIMOINE FLUORURE (FRENCH) see AQEOOO ANTIMOINE (TRICHLORURE d") see AQC500 ANTIMOL see SFBOOO ANTIMONIAL SAFFRON see AQF500 ANTIMONIC ACID see AQF750 ANTIMONIC CHLORIDE see AQDOOO ANTIMONIC OXIDE see AQF750 ANTIMONIC SULFIDE see AQF500 ANTIMONIO (PENTACLORURO DI) (ITALIAN) see AQDOOO... 

ISOOCTADECTTI ESTER see ISC550 PROPANOIC ACID, ETHENYL ESTER see VQKOOO PROPANOIC ACID, 2-HYDROXY- see LAGOOO PROPANOIC ACID, 2-HYDROXY-, TRIANHYDRIDE with ANTIMONIC ACID (HsSbOs) (9CI) see AQE250 PROPANOIC ACID, METHYL ESTER see MOTOOO PROP-WOIC ACID, 2-METHYL-, 3-HEXENYL ESTER. (Z)- see HFE520... 

Figure 1 Ion exchange ideality of uni-, di, and trivalent metal ions on cubic antimonic acid (C-SbA). Metal ions Li (O), Mg ( ) and Al ( ). Initial concentration of metals 10" mol dm weight of C-SbA, 0.10 g total volume, 10.0 cm, temp., 30°C. (From data of Refs. 4, 5, and 6.)...

Figure 9 The pH titration curves of precipitated antimonic acid. 1, pubiished titration curve for hydrogen hexahydroxo-antimonate H[Sb(OH)j] 2, freshly precipitated 3, after 5 months 4, after 10 months 5, after 1.5 years 6, after 2 years. (From B. G. Novikov, E. A. Mateova, and F. A. Beiinskaya, Zb. Neorg. Kbim., 20 1566 (1975). With permission.)...

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