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# Pyrophosphoric Acid Formula

## Pyrophosphoric Acid

Last updated date: 21st Mar 2023
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Pyrophosphoric acid can be defined as a chemical compound as an anhydride of acrylic phosphorus acid. It is formed by the conjugation of the two molecules of phosphoric acid. The conjugate of this chemical compound is an acid. The chemical compound is naturally found as a colourless and odourless chemical.

The chemical nature of pyrophosphoric acid can be defined as a hygroscopic substance. The hygroscopic substance can be defined as a compound that has the ability to retain water through absorption or adsorption.

This article focuses on the chemical formula of pyrophosphoric acid, structural formula poof the compound, preparative methods, use, chemical and physical properties, and also some common hazards and risks associated with the handling of the compound.

### Chemical Formula of Pyrophosphoric Acid

Pyrophosphoric acid can be defined as a chemical compound with a conjugate base called pyrophosphoric acid and the conjugate acid of the compound is known as the diphosphate. The chemical compound is also known as diphosphoric acid. The chemical formula of pyrophosphoric acid can be represented as the following, H$_{4}$P$_{2}$O$_{7}$. The alternative method of representation of the pyrophosphoric acid formula is [(HO)$_{2}$P(O)]$_{2}$O. The chemical formula represents that the elements involved in the formation of the chemical compound include hydrogen, oxygen, phosphate. The compound is formed by condensation of the two molecules of phosphoric acid. The IUPAC name of the compound is phosphono dihydrogen phosphate

The structural formula of pyrophosphoric acid can be represented as mentioned below.

### Preparative Methods

There are two most widely used methods for commercial production of the chemical compound (pyrophosphoric acid). The first method of large scale commercial production of the compound includes the ion exchange method from sodium pyrophosphate. The second most commonly used method is the treatment of lead pyrophosphate with the hydrogen sulfide compound.

### Common Names of Pyrophosphoric Acid

The IUPAC name of the compound is phosphono dihydrogen phosphate. The other common name of the compound is as follows,

• Diphosphoric acid

• Pyrophosphoric acid

• Phosphonooxyphosphonic acid

• Diphosphoric acid.

### Physical Properties of the Chemical Compound

The physical property of any chemical compound can be defined as a property that can be quantified (measured or observed) without altering the chemical composition or chemical formula of the compound. The physical properties of a compound include conductivity, physical appearance, melting point, boiling point, density. Some of the physical properties of pyrophosphoric acid can be mentioned as follows,

1. The physical state of the chemical compound is defined as solid.

2. The melting point of pyrophosphoric acid is 71.5- degree Celcius

3. The pyrophosphoric acid is readily soluble in water.

4. Pyrophosphoric acid is also soluble in diethyl ether and ethyl alcohol.

5. They crystallize and form polymorphs.

### Chemical Properties of Pyrophosphoric Acid

The chemical properties of a compound can be defined as the poetry of the compound quantified or observed during a chemical reaction and the identity or chemical composition of the compound is changed during the chemical reaction. The chemical property of the compound includes reactivity with other chemicals, toxicity, coordination number, flammability, enthalpy of formation, the heat of combustion, oxidation states, and chemical stability. Some of the chemical properties of pyrophosphoric acid are mentioned below

1. The pyrophosphoric acid formula can be represented as  H$_{4}$P$_{2}$O$_{7}$

2. The alternative way of representation of the chemical formula of pyrophosphoric acid is [(HO)$_{2}$P(O)]$_{2}$O

3. The molecular weight of the compound is 177.973 g/mol

4. The conjugate base of the compound is phosphoric acid

5. The conjugate acid of the compound is diphosphate.

6. The hydrogen bond donor count is 4.

7. The hydrogen bond acceptor count is 7

8. The number of rotatable bond in the chemical compound is 2

9. There is 1  covalently bonded unit

10. The complexity of pyrophosphoric acid is 147.

11. The anions and esters of the compound are known as pyrophosphates.

### Risk and Hazards

Pyrophosphoric acid is a medium-strong acid, there is not much known about the industrial application of the compounds thus there is not a very reliable source of risk associated with it. Although the acid is corrosive in nature, they are not toxic in nature.

### Conclusion

Pyrophosphoric acid is a medium-strong acid that is formed by the condensation of two molecules of phosphoric acid. It polymorphs crystal, there is no vital industrial use of the compound. The pyrophosphoric acid formula is written as H$_{4}$P$_{2}$O$_{7}$. The chemical compound is also found as an intermediate metabolic product of E.coli.

## FAQs on Pyrophosphoric Acid Formula

Q.1) What are Pyrophosphates?

Ans: The salts, anion as well as an ester of the compound is known as pyrophosphate.

Q.2) What is the Melting Point of Pyrophosphoric Acid?

Ans: The melting point of the compound is 71.5 degrees Celcius.

Q.3) What Is the Conjugate Base of Pyrophosphoric Acid

Ans: The conjugate base of the compound is phosphoric acid.