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Product Appearance
The appearance is a colorless viscous liquid, which crystallizes after being left for a long time and becomes a colorless glass. Pyrophosphate has strong coordination and is often used as an analytical reagent, such as a masking agent for the preparation of organic phosphates.
It can also be used in the copper electroplating process to adjust the pH value of the electroplating solution, and can also be used in other electroplating. It can also be used as a stabilizer for catalysts, metal refining, and organic peroxides.
basic product info
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Chinese name: |
Pyrophosphate (alias: Pisa grass) |
density: |
2.04g/cm3(25℃) |
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English name: |
Pyrophosphoric acid |
Exterior: |
colorless liquid |
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Chemical formula: |
H4P2O7 |
Molar refractive index: |
23.68 |
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Molecular weight: |
177.98 |
Molar volume (m3/mol): |
732.2 |
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CAS# |
2466-09-3 |
Isotonic specific volume (90.2K): |
262.9 |
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Melting point: |
61℃ |
Security description: |
S26 S36 S36/S37/S39 |
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Water solubility: |
soluble in water |
Hazard symbols: |
corrosion |
Properties and Stability
When pyrophosphate meets silver salt, white silver pyrophosphate precipitates. 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.
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