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Topic: Pyrophosphoric acid


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In the News (Tue 18 Jun 19)

  
  Phosphates - LoveToKnow 1911
Orthophosphoric acid, H3P04, a tribasic acid, is obtained by boiling a solution of the pentoxide in water; by oxidizing, red phosphorus with nitric acid, or yellow phosphorus under the surface of water by bromine or iodine; and also by decomposing a mineral phosphate with sulphuric acid.
Pyrophosphoric acid, 'H' 4 P 2 0 7, is a tetrabasic acid which may be regarded as derived by eliminating a molecule of water between two molecules of ordinary phosphoric acid; its constitution may therefore be written (HO) 2 0P O PO(OH) 2.
Metaphosphoric acid, HP0 3, is a monobasic acid which may be regarded as derived from orthophosphoric acid by the abstraction of one molecule of water, thus H 3 PO 4 - H 2 O = HP0 3; its constitution is therefore (HO)P0 2.
www.1911encyclopedia.org /Phosphates   (2717 words)

  
 Aluminum nitride power having improved water-resistance - Patent 4923689
A powder according to claim 1, wherein the organic phosphoric acid compound is an acid phosphate, an alkyl-, alkenyl- or aryl-ester of pyrophosphoric or polyphosphoric acid, a phosphonic acid or an ester thereof, or a mixture thereof.
A powder according to claim 4, wherein the acid phosphate is methyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, 2-ethylhexyl acid phosphate, lauryl acid phosphate, palmityl acid phosphate, stearyl acid phosphate, oleyl acid phosphate, phenyl acid phosphate or nonylphenyl acid phosphate.
The organic phosphoric acid compound in the form of alkali metal salt should not be used because such a phosphoric acid metal salt is not dissolved in a solvent used for the treatment and the metal part may remain in the resultant aluminium nitride powder.
www.freepatentsonline.com /4923689.html   (4213 words)

  
 Phosphoric Acid Encyclopedia Article @ Stooped.net   (Site not responding. Last check: 2007-11-05)
Orthophosphoric acid is a non-toxic, inorganic, rather weak triprotic acid which, when pure, is a solid at room temperature and pressure.
While phosphoric acid has the potential to release three hydrogen ions, in aqueous solution the third requires a high pH because PO is almost as strong a base as hydroxide ion.
Phosphoric acid is used as a flux by hobbyists (such as model railroaders) as an aid to soldering.
www.stooped.net /encyclopedia/Phosphoric_acid   (1866 words)

  
 Pyrophosphoric acid - Wikipedia, the free encyclopedia
Pyrophosphoric acid, also known under the name diphosphoric acid, is a syrupy liquid or a needle-like crystalline solid.
Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.
Pyrophosphoric acid is a medium strong inorganic acid.
en.wikipedia.org /wiki/Pyrophosphoric_acid   (130 words)

  
 phosphoric acid - HighBeam Encyclopedia
It is a tribasic acid and forms orthophosphate salts with either one, two, or all three of the hydrogens replaced by some other positive ion.
Salts of pyrophosphoric acid are pyrophosphates; salts of metaphosphoric acid are metaphosphates.
Phosphoric acid is prepared commercially by heating calcium phosphate rock with sulfuric acid; purer grades may be prepared by treating red phosphorus with nitric acid.
www.encyclopedia.com /doc/1E1-phsphracid.html   (401 words)

  
 Acid - The real meaning from Timesharetalk wikipedia   (Site not responding. Last check: 2007-11-05)
An acid (often represented by the generic formula HA) is traditionally considered any chemical compound that when dissolved in water, gives a solution with a pH of less than 7.0.
The strength of an acid may be understood by this definition by the stability of hydronium and the solvated conjugate base upon dissociation.
Nitric acid, sulfuric acid, and perchloric acid are all strong acids, whereas nitrous acid, sulfurous acid and hypochlorous acid are all weak.
www.timesharetalk.co.uk /wiki.asp?k=Acid   (1556 words)

  
 Radiopharmaceutical compositions and matrices and uses thereof - Patent 6348184   (Site not responding. Last check: 2007-11-05)
2466-09-3 (Pyrophosphoric acid); 7664-38-2 ((Phosphoric acid); 14000-31-8 (Pyrophosphate); and 14265-44-2 (Phosphate).
Generally speaking, radioactive salts of pyrophosphoric acid may be obtained by dehydration of radiolabelled orthophosphoric acid (H.sub.3 PO.sub.4) or a salt thereof, such as sodium orthophosphate radiolabelled with.sup.32 P. Radiolabelled orthophosphoric acid and salts thereof are commercially available from NEN (Boston, Mass.) and ICN Biomedicals, Inc. (Irvine, Calif.).
In embodiments which involve salts of pyrophosphoric acid containing radiolabelled phosphorous, and especially.sup.32 P, the implantation of the radioactive salts in a tumor in vivo may provide desirable exposure of the tumor to radiation while minimizing the exposure to radiation of nearby, normal tissue.
69.64.183.131 /6348184.html   (11889 words)

  
 Innophos
Polyphosphoric acid is a thick, viscous liquid consisting of linear molecules of various chain lengths.
If two molecules of phosphoric acid are heated to remove one molecule of water, pyrophosphoric acid is formed.
Polyphosphoric acid chains consist of PO tetrahedrons joined by a shared oxygen atom at the corner of the tetrahedra and connected by hydrogen bonds.
www.innophos.com /brochures/acid/page22.asp   (291 words)

  
 Sciencemadness Discussion Board - Powered by XMB   (Site not responding. Last check: 2007-11-05)
Oxalic acid?) Anyway, it heated nicely giving off lots of ammonia and turning some very pretty colors, I noticed that in the hottest areas of the vessel it turned white, upon cooling the vessel cracked, included is a picture of it, very pretty.
That would be the tripolyphosphoric acid, now look at it, the center P is the repeating unit in metaphosphoric acid, all metaphosphoric acid is, is this process reapeating itself until these chains are really long, thereby giving the repeating unit of these polymers.
It also lists several forms of metaphosphoric acid that can be made and the preparation of each, listing the metaphosphoric acid generated by heating orthophosphoric acid to red heat and hold it there as having the greatest dehydrating power.
www.sciencemadness.org /talk/viewthread.php?tid=4409   (2414 words)

  
 Organic phosphorus-phosphorus oxyacid compounds - Patent 6492444   (Site not responding. Last check: 2007-11-05)
Phosphorus containing compounds, such as, boron-phosphates, phosphates, and polyphosphates of ammonia, amines, polyamines, amino compounds, thioureas and alkyanolamines, boric acid and its salts and their derivatives, organic phosphorus compounds and their salts, halogenated organic phosphorus compounds, their salts and their derivatives may also be used for this purpose.
The nitrogen containing salts of phosphorus acids are the preferred carbonization compounds, such as amine phosphates, amine salts of organic phosphorus compounds, amino phosphate, amino salts of organic phosphorus compounds and amino condensation salt of inorganic and organic phosphorus compounds.
Suitable inorganic phosphorus compounds include, but not limited to phosphoric acid, pyrophosphoric acid, triphosphoric acid, metaphosphoric acid, phosphorous acid, hypophosphorous acid, phosphinic acid, phosphinous acid, phosphine oxide, phosphorus trihalides, phosphorus oxyhalides, phosphorus oxide, mono-metal hydrogen phosphates, ammonia dihydrogen phosphate, bromated phosphates, alkaline metal dihydrogen phosphate and halogenated phosphate-phosphite and their halides and acids.
69.64.183.131 /6492444.html?highlight=5788915   (7462 words)

  
 Phosphoric acids and Phosphates - Wikipedia, the free encyclopedia
The simplest compound of a series of phosphoric acids is sometimes called by its common name, orthophosphoric acid, but more often called by its IUPAC name, simply phosphoric acid, by both non-technical people and even many chemists.
These phosphoric acids series are generally water-soluble considering the polarity of the molecules.
Conversely, polyphosphoric acids or polyphosphates are often formed by dehydrating a phosphoric acid solution; in other words, removing water from it often by heating and evaporating the water off.
en.wikipedia.org /wiki/Phosphoric_acids_and_Phosphates   (1121 words)

  
 PHOSPHORIC ACID
Phosphoric acid is not irritating to the eyes or respiratory tract, unless it is introduced into the atmosphere as a spray or mist, because phosphoric acid has a low vapor pressure at room temperature.
Phosphoric acid particles are assumed to grow in a stepwise fashion to 99% relative humidity within conducting airways of the lung, having initially reached equilibrium at 90% relative humidity (T= 37 degrees) in the trachea.
Residues of phosphoric acid are exempted from the requirement of a tolerance when used as a buffer in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest.
www.frankmckinnon.com /phosphoric_acid.htm   (8589 words)

  
 Chapter Pygobranchia <i>to</i> Pyrogenic of P by Webster's Dictionary (1913 Edition)
An acid obtained by sybjecting another acid to the action of heat.
A salt of pyrogallic acid; an ether of pyrogallol.
A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and
www.bibliomania.com /2/3/257/1207/23711/5.html   (304 words)

  
 Formulae for pyro- and metaphosphoric acids   (Site not responding. Last check: 2007-11-05)
I need the formulae for pyrophosphoric acid and metaphosphoric acid as well as the formula for the polyatomic ions that both of these molecules form in water.
Thanks, eric englert cyberdolphin Gulf Breeze High teacher in Gulf Breeze FL Answer: Pyrophosphoric acid is the result of the condensation of two phosphoric acid molecules.
OH OH This is usually formed by heating phosphoric acid and driving off the water.
www.newton.dep.anl.gov /askasci/chem99/chem99174.htm   (169 words)

  
 INCT Home Page   (Site not responding. Last check: 2007-11-05)
Carbon-13 isotope fractionation in the decomposition of liquid formic acid of natural isotopic composition in the presence of pyrophosphoric acid has been studied in the temperature range 20-70°C. The initial fractionation of
C in the decarbonylation of formic acid catalyzed by dehydrating species depends on the initial ratio of the substrate-formic acid to the dehydrating pyrophosphoric acid introduced into the reaction vessel.
C fractionation in catalysed dehydration of F.A. on the degree of solvation of dehydrating species with water molecules derived from the decomposing formic acid.
www.ichtj.waw.pl /ichtj/nukleon/back/abstract/vol43_1998/v43n1p049.htm   (216 words)

  
 Untitled Document   (Site not responding. Last check: 2007-11-05)
Phosphoric acid can also making fertilizers for farm plants (and underwater plants) Phosphoric acid is like a handy cleaner, when you have to clean pipes.
Phosphoric acid is not sold in all stores but it is a good product in which places use to make food flavors.
Phosphoric acid: any of three acids, orthophosphoric acid, H3PO4, metaphosphoric acid, HPO3, or pyrophosphoric acid, H4P2O7, derived from phosphorus pentoxide, P2O5, and various amounts of water.
ccms.wcpss.net /students/projects/compounds/brantle0   (242 words)

  
 AllRefer.com - phosphoric acid, Compound & Element (Compounds And Elements) - Encyclopedia   (Site not responding. Last check: 2007-11-05)
AllRefer.com - phosphoric acid, Compound & Element (Compounds And Elements) - Encyclopedia
phosphoric acid, any one of three chemical compounds made up of phosphorus, oxygen, and hydrogen (see acids and bases).
More articles from AllRefer Reference on phosphoric acid
reference.allrefer.com /encyclopedia/P/phsphracid.html   (295 words)

  
 Phosphoric Acid CAS 7664-38-2 Suppliers & Manufacturers, Price - Page 4
Netherlands Sulphuric acid, Nitric acid, Phosphoric acid, Ammonium nitrate, Ammonium phosphate, Compound fertili More...
Philippines Phosphoric acid Tlx: (752) 23254 PHIL PHOS, (756) PSPATE PN More...
Switzerland Phosphoric acid, Poly and pyrophosphoric acid, Sodium hypophosphite.
www.chemicalregister.com /Phosphoric_Acid/Suppliers/Page4/pid7195.htm   (282 words)

  
 Pyrophosphoric Acid, Technical, Chemistry Supplies and Laboratory Chemicals
Pyrophosphoric Acid, Technical, Chemistry Supplies and Laboratory Chemicals
: F.W. May be partly liquid.!Contains variable amounts of orthophosphoric and polyphosphoric acids.
The LAB DEPOT is your source for laboratory chemicals equipment and scientific supplies including Pyrophosphoric Acid, Technical, reagent chemicals, research products and lab test kits for water purification and pH sampling.
www.labdepotinc.com /Chemical_Details~pid~P1565.aspx   (141 words)

  
 Pyrophosphoric Acid, Technical - Inorganic Chemicals * 2466-09-3
Pyrophosphoric Acid, Technical - Inorganic Chemicals * 2466-09-3
Chemical Catalog &#160;» Inorganic Chemicals  » Pyrophosphoric Acid, Technical
    F.W. May be Partly Liquid; Contains Variable Amounts of Orthophosphoric and Polyphosphoric Acids
www.sciencelab.com /page/S/PVAR/23040/SLP1288   (62 words)

  
 (WO/2004/005528) PYROPHOSPHORIC ACID BATH FOR USE IN COPPER-TIN ALLOY PLATING   (Site not responding. Last check: 2007-11-05)
(WO/2004/005528) PYROPHOSPHORIC ACID BATH FOR USE IN COPPER-TIN ALLOY PLATING
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Latest bibliographic data on file with the International Bureau
www.wipo.int /pctdb/en/wo.jsp?KEY=04/05528.050414   (335 words)

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