CAS:2466-09-3| Pyrophosphoric Acid

Introduction and application of CAS:2466-09-3| Pyrophosphoric acid

Pyrophosphoric acid is a colorless needle-shaped crystal or colorless viscous liquid. It crystallizes after being left for a long time and becomes colorless glass. Pyrophosphate has strong coordination. Excess P2O74- can dissolve insoluble pyrophosphates (Cu2+, Ag+, Zn2+, Mg2+, Ca2+, Sn2+, etc.) to form complex ions, such as [Cu(P2O7)2] 6-, [Sn(P2O7)2]6-, etc. It is often used as a catalyst in industry to make organophosphates, etc. When pyrophosphate meets silver salt, a white silver pyrophosphate precipitate is obtained. The conversion rate of P2O74- to PO43- in the solution is very slow. This reaction can be used to identify P2O74- and PO43- (Ag3PO4 is a yellow precipitate). When orthophosphoric acid is heated to 210°C, it loses water and becomes pyrophosphoric acid. Soluble in ethanol and ether. It is corrosive and can cause burns. Solid crystalline pyrophosphoric acid is highly hygroscopic and soluble in water, ethanol, and ether. When heated above the melting point, it decomposes into liquid acids containing orthophosphoric acid, pyrophosphoric acid, trimetaphosphoric acid, polymetaphosphoric acid, etc. Crystallized pyrophosphoric acid does not decompose very well in ice water, but it decomposes at high temperatures and the amount of orthophosphoric acid increases. The general solid crystal is Type I pyrophosphoric acid (melting point 54.3°C). When Type I crystals are heated at about 50°C for several hours in a closed tube, they become Type II pyrophosphate (melting point 71.5°C). This product is stable at room temperature. The acidic pyrophosphate, tetrametaphosphoric acid or other polyphosphoric acid chain and cyclic structures are formed by the dehydration and condensation of orthophosphoric acid, and they are all condensation acids. Generally, the acidity of condensed acids is greater than that of single acids. This is because the condensed acid ion is large in size and the negative charge density on its surface is much reduced, so the condensed acid can easily dissociate protons. The greater the degree of condensation of similar oxygen-containing acids, the stronger the acidity. Uses Moisture retaining agent, quality improver, pH regulator, metal chelating agent.

Specification of CAS:2466-09-3| Pyrophosphoric acid

diphosphoric acid
Molecular formula: H4P2O7
Molecular weight: 177.98
Exact mass: 177.94300

CAS number: 2466-09-3

Appearance and properties: Colorless needle-like crystals or yellow viscous liquid
Solubility: soluble in water and easily soluble in alcohol and ether.
Density: 2.43 g/cm3
Melting point: 54.3 °C (25 degrees, 1 atmosphere)

Package of CAS:2466-09-3| Pyrophosphoric acid

100G/1kg/25kg drum

This product is valid for 24 months from the production date when stored in a warm sealed state.

Safety and Transportation

This product should be stored and sealed at room temperature. Customers should carefully read the product treatment, material safety data sheet (MSDS), and labels before use, be familiar with the product's safety information, operating instructions, and environmental impact, and wear appropriate personal protection as required. supplies.

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