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Topic: Arsenous acid

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  Arsenic acid - Wikipedia, the free encyclopedia
, is the acid form of arsenate ion, AsO
Arsenic acid is used in wood treatment, finishing agent for glass and metal, in the manufacturing of dyestuffs and organic arsenic compounds and also in soil sterilant.
It can moreover be used as a herbicide, insecticide or rodenticide.
en.wikipedia.org /wiki/Arsenic_acid   (92 words)

 Nat' Academies Press, Arsenic: Medical and Biological Effects of Environmental Pollutants (1977)   (Site not responding. Last check: 2007-10-18)
Chemistry of Arsenic TABLE 2-1 Arsenic Compounds of Environmental Importance s Arsenic tnoxide Arsenic pentoxide o-Arsenous acid o-Arsen~c acid m-Arsenous acid Salts of arsenous acid: arsenates Salts of arsenic acid: arsenates Tetraarsenic tetrasulfide Arsenic tmsulfide Arsenic pentasulfide Methanearsonic acid Cacodylic acid Tnmethylarsine oxide Methyldihydroxyarsine Dimethylhydroxyarsine Tnmethylarsine Arsanilic acid 3-Nitro-4-hydroxyphenyl.
It is a fairly strong acid, with pKa values reported as 2.20, 6.97, and 1 1.53.256 Arsenic acid is an oxidizing agent in acid solution, with an E° value of 0.56 V for the reaction:~69 H3AsO4 + 2H+ + 2e-~HAsO2 + 2H2O.
For methanearsonic acid to be trans- formed to dimethylarsine or trimethylarsine, a reduction of the pen- tavalent compound within the biologic system must occur.
www.nap.edu /openbook/0309026040/html/4.html   (3341 words)

 arsenic acid Chemical Fact Sheet 9/86   (Site not responding. Last check: 2007-10-18)
- Mutagenicity: - The sodium salt of arsenic acid (sodium arsenate) and the sodium salt of arsenous acid (a related form of arsenic) have been found to be mutagenic, that is, to interact with DNA to cause heritable effects.
The pentavalent form, such as arsenic acid, is metabolized by reduction into the trivalent form, followed by transformation into organic forms which are excreted within several days via the urine.
Arsenic acid is slightly toxic to fish and moderately toxic to aquatic invertebrates.
pmep.cce.cornell.edu /profiles/miscpesticides/alphaalkyl-metaldehyde/arsenic-acid/anti-prof-ars-acid.html   (1713 words)

 Nat' Academies Press, Arsenic in Drinking Water (1999)
Another major difference between arsenic and phosphorus is the stability of the esters of phosphoric acid to hydrolysis, allowing the existence of, for example, DNA and adenosine 5'-triphosphate (ATP).
Johnsongrass and methanearsonic acid Sorghum halepense, reduction of methanearsonate to arsenosomethane, inhibition of malic enzymes.
Metabolism and excretion of orally administered dimethylarsinic acid in the hamster.
www.nap.edu /books/0309063337/html/27.html   (5576 words)

 ARSENIC   (Site not responding. Last check: 2007-10-18)
Dimethylarsinic acid was tested for carcinogenicity by administration in drinking-water in mice and rats.
Dimethylarsinic acid is a tumour promoter in the skin and lung of mice, and in the liver, urinary bladder, kidney and thyroid gland of rats.
Methylarsenous acid and dimethylarsinous acid are intermediary metabolites in the methylation of arsenic.
monographs.iarc.fr /htdocs/monographs/vol84/84-01-arsenic.html   (2354 words)

 Arsenous acid, Trisodium salt - toxicity, ecologicial toxicity and regulatory information
Identifying information, including synonyms, ID numbers, use type, chemical classification, a link to a list of all products containing this chemical and a list of the top crops this pesticide is used on in California.
Chemical Identification and Use for Arsenous acid, Trisodium salt
Sorry, no water quality standards or criteria have been established for this chemical by the U.S. or Canadian governments; however, there may be criteria established for related chemicals.
www.pesticideinfo.org /Detail_Chemical.jsp?Rec_Id=AQ5976   (333 words)

 Guide to specification for: General notices; General analytical techniques; Identification tests; Test solutions and ...   (Site not responding. Last check: 2007-10-18)
Dissolve 2.0 g of chromotropic acid (4,5-dihydroxy-2,7-naphthalene-disulfonic acid, disodium salt) in 40 ml of water in a 1-litre volumetric flask.
Add 7.5 ml of sulfuric acid to 100 ml of water, and dissolve 80 g of ferrous sulfate in the mixture with the aid of heat.
Dissolve 90 g of manganese sulfate in 200 ml of water, 175 ml of phosphoric acid and 350 ml of diluted sulfuric acid (1 in 2).
apps3.fao.org /jecfa/additive_specs/docs/t0368e/T0368e16.htm   (8283 words)

 Inorganic arsenic compounds other than arsine (HSG 70, 1992)
As 1303-28-2 Arsenic acid; arsenic acid anhydride; arsenic [V] oxide; diarsenic pentoxide; arsenic oxide Arsenicsulfide As 1303-33-9 Arsenic sesquisulfide; arsenic sulfide; arsenic tersulphide; arsenic trisulphide; arsenic yellow; arsenious sulphide; arsenous sulphide; auripigment; C.I. pigment yellow; diarsenic trisulphide; orpiment; King's Gold Arsenic AsCl
A number of microorganisms (e.g., fungi and bacteria in soil, algae in water) have the capacity to methylate inorganic arsenic to the much less acutely toxic compounds methane-arsonic acid and dimethylarsinic acid (cacodylic acid); the latter is readily converted in soil to the volatile methylarsines.
Arsine may also be produced when arsenic is in contact with acids in the presence of some metals, e.g., zinc or iron, as a consequence of the liberation of hydrogen.
www.inchem.org /documents/hsg/hsg/hsg070.htm   (5514 words)

 APS - 2005 APS March Meeting - Event - Stability of an iodate arsenous-acid reaction front in the presence of ...   (Site not responding. Last check: 2007-10-18)
Abstract: C1.00066 : Stability of an iodate arsenous-acid reaction front in the presence of Poiseuille flow
An iodate arsenous acid reaction front propagating against gravity provides an excellent context in which to examine stability.
We extend the existing theory that describes the iodate arsenous acid reaction front to include this Poiseuille flow.
meetings.aps.org /Meeting/MAR05/Event/28335   (133 words)

 [No title]
(c) Arsenic acid is a product of the reaction between nitric acid and arsenous acid (H3AsO3); nitrogen monoxide and water are also produced.
Malonic acid is a diprotic acid with the molecular formula H2C3H2O4.
A sample of the impure white powder is titrated using a standard 0.200 M KOH solution and requires 30.84 mL of KOH solution to reach the endpoint.
www-class.unl.edu /chem109/downloads/exam2.doc   (939 words)

 ATSDR - MMG: Arsenic Trioxide
(As Synonyms include arsenic oxide, arsenious acid, arsenious oxide, arsenious trioxide, arsenous acid anhydride, crude arsenic, arsenolite, and white arsenic.
If arsenic trioxide is exposed to hydrogen gas or to the combination of acid (acid fumes) or water and active metals, the reaction can form toxic arsine gas (see Medical Management Guideline for Arsine).
DMSA is approved for the treatment of pediatric lead poisoning in the United States; it also has been used successfully to chelate arsenic in humans, and is being further evaluated for this use.
www.atsdr.cdc.gov /MHMI/mmg168.html   (5445 words)

 Lecture No. 2. Chemical Fundamentals   (Site not responding. Last check: 2007-10-18)
+ 2 SO In these examples, chalcocite consumes acid, because copper is oxidized from Cu (I) to Cu (II); covellite oxidation is a completely neutral reaction, neither producing nor consuming acid; and arsenopyrite oxidation produces the very weak arsenous acid.
Because pyrite is commonly present in sulfidic rocks at a fairly high concentration, and because it is the principal source of reduced iron in most rocks, pyrite is the source of most acid mine drainage.
(Arsenous acid is weak enough so that it remains substantially unionized under neutral or acidic conditions.) We have now accomplished step 1.
www2.umt.edu /Geology/faculty/moore/G431/lectur2.htm   (2187 words)

 Arsenic (PIM G042)
Following accidental splashing of an arsenic acid solution, local effects (pain and swelling at the site of contact) were noted, followed several hours later by gastrointestinal disturbances: nausea, vomiting, diarrhoea, stomach pains.
Inorganic arsenic (contaminated sulfuric acid) as a cause of death was pointed out several months later and the amount of arsenic used in the preparation of beer was estimated to several tons.
The total number of cases, recorded in several locations, was estimated to about 6000 and the number of death to about 70.
www.intox.org /databank/documents/chemical/arsenic/pimg042.htm   (7340 words)

 Active Skim View of: 2 Chemistry of Arsenic
The arsenic trisulf~de and pentasulfide are formed when hydrogen sulfide reacts with trivalent or pentavalent inorganic arsenic compounds in the presence of hydrochloric acid.
Se, NR Y = 0, S Se, Te, NR X= halogen Arsonic acid Diorganylarsinic acid The organic arsenic compounds that have environmental importance are those that contain methyl groups, the aromatic arsenic derivatives used as feed additives and in veterinary medicine, and a few others that may be important in biologic cycles.
The arsenic-carbon bonds are very stable, but are cleaved by heating with solid sodium hydroxides or chromium trioxide.~7 The acid has a pKa value of 6.2.4 In strongly acidic solution, cacodylic acid exhibits basic properties and forms adducts with mineral acids.396 The reactions of cacodylic acid are summarized in Figure 2-3.
www.nap.edu /nap-cgi/skimit.cgi?recid=9003&chap=4-15   (663 words)

 [No title]   (Site not responding. Last check: 2007-10-18)
In the light of your previous answer and the structure of this molecule speculate as to the explanation for the relatively small change in the values of Ka.
Explain how a buffer is selected, and how the concentrations of the compounds that make up the buffer are determined.
On the axis shown below please plot the titration curve for this acid indicating (a) the initial pH, (b) the pH at the equivalence point and (c) the pH at the ½ equivalence point.
neon.chem.uidaho.edu /~honors/ex02sp00.html   (691 words)

 CHEM 1212 Spring 2005   (Site not responding. Last check: 2007-10-18)
The titration of a 2.38 g sample of arsenous acid (H
In this reaction, the arsenous acid is oxidized to arsenic acid (H
For each of the following equations, balance, determine the standard potential, identify the direction of spontaneous reaction and determine the number of electrons transferred.
www.daltonstate.edu /faculty/vguarisco/CHEM1212/Quizzes/1212Sp05Q20d.html   (121 words)

 KODAK: H-24 Module 4 Reagent Preparation Procedures   (Site not responding. Last check: 2007-10-18)
Arsenic Trioxide, As Also: Arsenous Oxide, Arsenous Acid Anhydride, Arsenous Acid, Arsenic Sesquioxide or White Arsenic
Rinse down the sides of beaker with distilled water from a wash bottle and swirl.
Add, from a tip-up pipet, 30 mL of 1.0 N sulfuric acid; cool to room temperature.
www.kodak.com /US/en/motion/support/processing/h244/sodiArse.shtml   (139 words)

The water is an acid Na-Cl-SO4 type, but it has an anomalously low As/Cl ratio compared with most other hot springs in the Park, indicating removal of arsenic from the thermal water by precipitation.
Speciation calculations indicate that thioarsenites and arsenous acid predominate.
Inclusion of thioarsenites reduces substantially (orders of magnitude) the activity of arsenous acid and the orpiment ion-activity product.
gsa.confex.com /gsa/2003AM/finalprogram/abstract_57639.htm   (405 words)

 Environmental Protection Agency   (Site not responding. Last check: 2007-10-18)
Arsenic Trioxide; Arsenic (III) Oxide; Arsenic Oxide; Arsenic Sesquioxide; Arsenicum Album; Arsenious Acid; Arsenious Oxide; Arsenious Trioxide; Arsenite; Arsenolite; Arsenous Acid; Arsenous Acid Anhydride; Arsenous Anhydride; Arsenous Oxide Anhydride; Arsodent; Claudetite; Crude Arsenic; Diarsenic Trioxide; White Arsenic
Toxic fumes of arsenic trioxide and arsine may be formed in fire situations (*CHRIS 1980).
Sodium chlorate; fluorine; chlorine trifluoride; chromic oxide; aluminum chloride; phosphorus pentoxide; hydrogen fluoride; oxygen difluoride (*NFPA 1978); tannic acid; infusion cinchona and other vegetable astringent infusions and decoctions; iron in solution (*Merck 1976).
yosemite.epa.gov /oswer/CeppoEHS.nsf/Profiles/1327-53-3?OpenDocument   (556 words)

 [No title]   (Site not responding. Last check: 2007-10-18)
Also known as arsenic oxide; arsenious acid); (arseneous oxide, see arsenic trioxide)) not_found= f680= f781_subdivision= 667_geographic_subdivision= bfm= pattern=Carbon dioxide comments=Additional 450s: Arseneous oxide; Arsenious acid; Arsenious oxide; Arsenious trioxide; Arsenous acid anhydride; Arsenous anhydride; Crude arsenic; White arsenic.
Of, relating to, or containing arsenic -- used esp. of compounds in which this element is trivalent); (arsenous, var.
Cataloger’s note: The McGraw-Hill reference provides a separate entry for arsenolite (defined as a mineral crystallizing in the isometric system), with the same chemical formula as arsenic trioxide.
www.loc.gov /catdir/pcc/prop/requests/completed/sa13295   (162 words)

 National Cancer Institute - NCI Drug Dictionary
The mechanism of action of arsenic trioxide is not completely understood.
This agent causes damage to or degradation of the promyelocytic leukemia protein/retinoic acid receptor-alpha (PML/RARa) fusion protein; induces apoptosis in acute promyelocytic leukemia (APL) cells and in many other tumor cell types; promotes cell differentiation and suppresses cell proliferation in many different tumor cell types; and is pro-angiogenic.
Check for active clinical trials or closed clinical trials using this agent.
cancertrials.nci.nih.gov /Templates/drugdictionary.aspx?CdrID=43067   (79 words)

 strength and stability of acids   (Site not responding. Last check: 2007-10-18)
An acid has a conjugate base, and a base has a conjugate acid.
Therefore, the stronger the conjugate base, the weaker the acid, and the stronger the conjugate acid, the weaker the base.
They exist in some sort of equilibrium with the acidic ion, basic ion, and weak acid.
www.uvm.edu /~swgordon/131-01/131web/joeshilkofski/strengthandstability.html   (173 words)

 LAMPIRAN I   (Site not responding. Last check: 2007-10-18)
Arsenous oxide; Arsenous acid; Arsenous acid anhydrid; Arsenous oxide, Arsenic sesquioxide white arsenic
Teraphtalic acid; 1,4- benzenedicarboxyclic acid; p-pthalic acid, Tepthol
Athyl acrylate; 2-propenoic acid ethyl ester; acrylic acid ethyl ester
www.ri.go.id /produk_uu/isi/pp2001/lampp74'01.htm   (182 words)

 International Chemical Safety Cards (WHO/IPCS/ILO)
No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
The solution in water is a weak acid which may react with reducing substances producing very toxic gas (arsine - see ICSC 0222).
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.
www.palmbeach.k12.fl.us /FinMan/FINANCIALDIVISIONS/EmpBenRiskMgmt/cd/nioshdbs/ipcsneng/neng0378.htm   (486 words)

 NTP-CERHR: Chemicals - Arsenic
Synonyms: Arsenic oxide; Arsenic (III) oxide; Arsenous trioxide; arsenous acid; arsenous oxide; arsenic sesquioxide; White Arsenic; Diarsenic Trioxide; Crude Arsenic; Arsenic (white); Arsenious oxide; Arsenic (III) trioxide; Arsenous anhydride; arsenite; arsenolite; arsenous acid anhydride; arsenous oxide anhydride; arsodent; claudelite; claudetite; Arsenic oxide (3); Arsenic oxide (As2O3); Arsenic sesquioxide (As2O3); Arsenicum album; Diarsonic trioxide; Diarsenic oxide
Synonyms: Sodium orthoarsenate; Disodium hydrogen arsenate; Arsenic acid, disodium salt; Sodium Arsenate Dibasic
National Toxicology Program (NTP), within the U.S. Department of Health and Human Services, is an interagency program headquartered at the National Institutes of Health's National Institute of Environmental Health Sciences (NIEHS) located in Research Triangle Park, NC.
cerhr.niehs.nih.gov /chemicals/arcenic/arsenic.html   (147 words)

 Chemical Toxicity Studies for Arsenous acid, Trisodium salt on All Organism Groups Chemical Toxicity Studies
Chemical Toxicity Studies for Arsenous acid, Trisodium salt on All Organism Groups Chemical Toxicity Studies
Home > Chemical Search > Arsenous acid, Trisodium salt Information
Toxicity Studies for Arsenous acid, Trisodium salt on All Organism Groups - Toxicology studies from the primary scientific literature on aquatic organisms
www.pesticideinfo.org /List_AquireAll.jsp?Rec_Id=AQ5976   (133 words)

 Herballoveshop.com : Arsenicum Album 6X - 250 tabs., (Hylands)
For a limited time, get 5% Off Entire Purchases on all products!
Arsenicum Album (Arsenous Acid) is a homeopathic remedy that may be used for diarrhea, cramps, gastroenteritis, hay fever, chills, dermatitis, inflammation of all degrees of severity in all organs, serious infections, diseases of attrition, benign and malignant proliferation of tissue and emotional discord or upset.
Hyland's Homeopathic Medicines are manufactured according to the standards set forth in the Homeopathic Pharmacopoeia of the United States.
www.herballoveshop.com /product.asp?PID=5910   (317 words)

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