Phosphotungstic Acid In Dhule

GradeIndustrial Grade

ApplicationDyeing agent

PurityHigh Purity

UsageTextile industry

StorageCool & Dry place

AppearanceWhite or Cream

GradeReagent grade

ApplicationAnalytical chemistry

Purity99% min

UsageCatalyst

StorageCool

AppearanceYellow powder

MOQ50 Kilograms/Kilograms

Physical StatePowder

PurityHigh

Shelf Life5 Years

UsageIndustrial

GradeIndustrial

TypeIndustrial Lab Chemicals

MOQ1 Liter/Liters

TypeSchool Lab Chemicals

MOQ25 Kilograms/Kilograms

Properties25

CAS Number12027-38-3

Purity>99%

AppearanceYellowish

SolubilityWater soluble

Molecular FormulaH3PW12O40

Molecular Weight2879.9 g/mol

Molecular FormulaH3PW12O40

Other NamesTungstophosphoric Acid

Structural FormulaH3[PW12O40]

Molecular Weight2880.05 g/mol

Density4.13 Gram per cubic centimeter(g/cm3)

PoisonousNo

MOQ25 Kilograms/Kilograms

Density960 Kilogram per cubic meter (kg/m3)

Molecular FormulaH3PW12O40

FormPowder

Melting Point89 i?1/2C

GradeOther Bio-Tech Grade

UsageFor Laboratory and Industrial

MOQ25 Kilograms/Kilograms

PropertiesPhosphotungstic acid can be prepared by the reaction of sodium tungstate Na2WO4.2H2O with phosphoric acid H3PO4 acidified with hydrochloric acid HCl.[2]Phosphotungstic acid solutions decompose as the pH is increased. A step-wise decomposition has been determined and the approximate compositions at various pH values are as follows:[8]pH principal components1.0 [PW12O40]3a^'2.2 [PW12O40]3a^' [P2W21O71]6a^' [PW11O39]7a^'3.5 [PW12O40]3a^' [P2W21O71]6a^' [PW11O39]7a^' [P2W18O62]6a^' [P2W19O67]10a^'5.4 [P2W21O71]6a^' [PW11O39]7a^' [P2W18O62]6a^'7.3 [PW9O34]9a^'8.3 PO43a^' WO42a^'The species [PW11O39]7a^' is a lacunary or defective Keggin ion. The [P2W18O62]6a^' has a Dawson structure. At pH less than 8 the presence of ethanol or acetone stabilises the anion [PW12O40]3a^' reducing decomposition.[8]Tungstophosphoric acid is thermally stable up to 400 AdegC and is more stable than the analogous silicotungstic acid H4SiW12O40.[9]Large quantities of polar molecules such as pyridine are absorbed into the bulk phase and not simply on the surface. Solid state NMR studies of ethanol absorbed in the bulk phase show that both protonated dimers ((C2H5OH)2H+) and monomers (C2H5OH2+) are present.Phosphotungstic acid is less sensitive to reduction than phosphomolybdic acid. Reduction with uric acid or iron(II) sulfate produces a brown coloured compound. the related silicotungstic acid when reduced forms a similar brown compound where one of the four W3 units in the Keggin structure becomes a metal-metal bonded cluster of three edge shared W(IV) octahedra.[10]Phosphotungstic acid is the strongest of heteropolyacids. Its conjugate base is the PW12O403a^' anion.[11] Its acidity in acetic acid has been investigated and shows that the three protons dissociate independently rather than sequentially and the acid sites are of the same strength.[12] One estimate of the acidity is that the solid has an acidity stronger than H0 =a^'13.16[9] which would qualify the compound as a superacid. This acidic strength means that even at low pH the acid is fully dissociated.

CAS No1343-93-7

UsageCatalystIn common with the other heteropolyacids phosphotungstic acid is a catalyst and its high acidity and thermal stability make it a catalyst of choice according to some researchers.[13] It is in solution as a homogeneous catalyst and as a heterogeneous catalyst "supported" on a substrate e.g. alumina silica. Some acid catalysed reactions include:the homogeneous catalysis of the hydrolysis of propene to give 2-propanolthe homogeneous catalysis of the Prins reactionthe heterogeneous catalysis of the dehydration of 2-propanol to propene and methanol to hydrocarbons.Dyeing and pigmentsPhosphotungstic acid has been used to precipitate different types of dyes as "lakes".[14] Examples are basic dyes and triphenylmethane dyes e.g. pararosaniline derivatives.HistologyPhosphotungstic acid is used in histology for staining specimens as a component of phosphotungstic acid haematoxylin PTAH and aEURoetrichromeaEUR reagents and as a negative stain for imaging by a transmission electron microscope.Phosphotungstic acid haematoxylin (PTAH)Mallory described the reagent now generally known as PTAH in 1897.[16] PTAH stains tissues either reddish brown or blue depending on their type. This property of simultaneously staining two different colours is different from other haematoxylin reagents e.g. alum-haematoxylin. The role of phosphotungstic acid and the mechanism of staining is not fully understood. Interestingly the active component of haematoxylin is the oxidised form haematin although this rarely acknowledged in the literature which refer to haematoxylin staining. Phosphotungstic acid forms a lake with haematin.[17] The make aEUR"up of the reagent is uncertain examination of a year old sample showed there to be three coloured components blue red and yellow.[18] These were not identified. Some investigations of aEURoemodelaEUR systems reacting various compounds such as amino acids purines pyrimidines and amines with PTAH show that they give rise to different colours.Trichrome reagentsIn these reagents two or three basic dyes are used with phosphotungstic acid in either a one step or multi-stage procedure. These reagents colour different tissue types different colours. Again the mechanism of staining is not fully understood. Some explanations include the proposal that phosphotungstic acid acts as a mordant to bind the dye to the tissue[20] or that alternatively it binds to tissue blocking it to dye molecules.Negative stainingAdsorption onto tissue or the surface of viruses and its electron density are the bases of phosphotungstic acids action as a negative stain. This electron density arises from the presence of the 12 tungsten atoms which each have an atomic number of 74. The mechanism of the adsorption onto tissue has been proposed as being electrostatic rather than involving hydrogen bonding as adsorption is not affected by pH.AnalysisThe potassium salt is only slightly soluble unlike most other phosphotungstate salts and has been proposed as a method for the gravimetric analysis of potassium.Precipitation of proteinsIn a number of analytical procedures one of the roles of phosphotungstic acid is to precipitate out proteins. It has been termed a "universal" precipitant for polar proteins.[23] Further studies showed that no precipitation occurred with I+--amino groups but did occur with guanidino Iu-amino and imidazole groups.MedicinalVery little work appears to have been carried out in this area. One example relates to liver necrosis in rats.Composite proton exchange membranesThe heteropoly acids including phosphotungstic acid are being investigated as materials in composite proton exchange membranes such as Nafion. The interest lies in the potential of these composite materials in the manufacture of fuel cells as they have improved operating characteristics

StorageRoom Temperature

Molecular Weight2880.2 g/mol Kilograms (kg)

Shelf Life5 Years

MOQ20 Kilograms/Kilograms

Molecular FormulaH3PO4

ClassificationInorganic Acids

Inorganic Acid TypesPhosphoric Acid

Purity99%

Appearanceliquid

CAS No7664-38-2

MOQ25 Kilograms/Kilograms

Physical FormPowder

Purity99%

GradeReagent

Molecular Weight2880.2 Milligram (mg)

Molecular FormulaH3PW12O40

StorageRoom Temperature

Purity99.9%

FormPowder

PackagingWide-mouth jar

CAS Number12027-38-2

Molecular Weight2879.84 g/mol

SolubilitySoluble in water