Tungstic Acid

MOQ100 Kilograms/Kilograms

StorageRoom Temperature

Molecular Weight249.85 GSM (gm/2)

Purity99%

Boiling point1,473 AdegC

SolubilityWater

Density5.59 Gram per cubic centimeter(g/cm3)

Chemical FormulaH2WO4.2H2O

Molecular Weight249.87

Assay99.0% Min

Sulphur0.060% Max

MolybdenumTraces

ArsenicLess Than 2PPM

MOQ100 Kilograms/Kilograms

Purity99%

Packaging TypeHDPE Drum, poly bag, as required

Molecular Weight249.85 g/mol

Melting PointNot defined (decomposes)

SizeStandard packings or as required

UsageUsed in laboratory analysis, ceramic industry, pigment manufacturing

MOQ10 , Kilograms/Kilograms

Density5.59 Gram per cubic centimeter(g/cm3)

SolubilityWater

Molecular FormulaH2WO4

StorageRoom Temperature

Ph LevelHigh

Melting Point100 AdegC

MOQ1 Kilograms/Kilograms

Delivery Time96 Hours

MOQ50 Kilograms/Kilograms

TasteData not available

Molecular FormulaH4[SiW12O40]

HS Code28399000

Boiling pointData not available

Structural FormulaH4[SiW12O40]

Molecular Weight2874.1 g/mol

MOQ25 Kilograms/Kilograms

Physical FormPowder

SolubilityInsoluble Matters in water: Less than 0.20% / Screening Test

Molecular Weight224 Grams (g)

GradeIndustrial

Purity65% min

CAS No84-87-7

MOQ10

HS Code2811

Molecular FormulaH3PW12O40

ShapeCrystal

Physical FormPowder

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

GradeExtra Pure

MOQ10 Kilograms/Kilograms

Structural FormulaH4[SiW12O40]aEURC/xH2O

Boiling pointNot Applicable (decomposes before boiling)

Molecular Weight286.0 g/mol

HS Code28259020

SmellOther, Odorless

PoisonousYES

MOQ25

ApplicationIndustrial

Molecular FormulaH2O4W

Molecular Weight249.86 g/mol Grams (g)

IngredientsTungstic acid (H2WO4)

Product TypeInorganic Compound

Physical FormPowder

MOQ1 Kilograms/Kilograms

Molecular Weight249.85 g/mol

Packaging TypeHDPE Bottle/Drum, Bag

Flash PointNon-flammable

Purity99%

Storage InstructionsStore in a cool and dry place, away from direct sunlight

Shelf Life24 months

MOQ25 Kilograms/Kilograms

Physical FormPowder

Purity99%

GradeReagent

Molecular Weight2,880.2 Milligram (mg)

Molecular FormulaH3PW12O40

StorageRoom Temperature