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Pyrophosphoric acid is an anhydride of acrylic phosphorus acid and is a chemical substance. Pyrophosphates are the anions, salts, and esters of pyrophosphoric acid. It is made up of two phosphoric acid molecules conjugated together. This chemical compound's conjugate is an acid. The chemical compound is found in nature as a colorless, odorless substance. Pyrophosphoric acid is a hygroscopic material, according to its chemical nature with a potential to retain water by absorption or adsorption.
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Key Terms: Pyrophosphoric Acid, Pyrophosphates, Molecules, Phosphorus acid, Adsorption, Anions, Salts, Esters, Acid, Diphosphoric acid, Condensation
Pyrophosphoric Acid: Formula and Structure
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Pyrophosphoric acid is a chemical compound that has a pyrophosphoric acid conjugate base and a diphosphate conjugate acid. Diphosphoric acid is another name for the chemical substance. Pyrophosphoric acid has the following chemical formula: H4O7P2.
Chemical formula indicates that hydrogen, oxygen, and phosphate are among the ingredients involved in the chemical compound's production. Condensation of two phosphoric acid molecules produces the chemical. The compound's IUPAC name is phosphono dihydrogen phosphate. The structural formula for pyrophosphoric acid is as follows.
Pyrophosphoric Acid
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| Decomposition Reaction | Displacement Reaction | Oxides of Nitrogen |
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Pyrophosphoric Acid: Preparation Method
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For commercial manufacture of the chemical compound, there are two main approaches (pyrophosphoric acid). The ion exchange method from sodium pyrophosphate is the first approach for large-scale commercial synthesis of the chemical.
Ion exchange can be used to obtain the acid solution in pure form by passing a watery solution of sodium pyrophosphate, Na4P2O7, through an appropriate cation exchange column. The treatment of lead pyrophosphate with hydrogen sulphide is the second most widely utilized approach.
Heating orthophosphoric acid to 523 K - 533 K can also make pyrophosphoric acid (H4O7P2). Heating orthophosphoric acid to 215°C can be used to make this acid.
2H3PO4 → H4P2O7 + H2O
Pyrophosphoric Acid: Preparation
Dry gaseous hydrogen chloride can be passed through crystals of disodium phosphate to make this acid. If there is a surplus of hydrogen chloride in the mixture, it can be eliminated by heating it until all of the hydrogen chloride has been removed. Long-term heating, especially above 180° C, makes orthophosphoric acid dehydrates and becomes pyrophosphoric acid (H4O7P2).
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Pyrophosphoric Acid: Physical Properties
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A chemical compound's physical property can be defined as a property that is quantifiable (calculated or seen) without changing the compound's chemical composition or chemical formula. Conductivity, physical appearance, melting point, boiling point, and density are all physical qualities of a compound.
Following are some of the physical features of pyrophosphoric acid:
- The chemical compound's physical state is defined as solid.
- Pyrophosphoric acid has a melting point of 71.5 degrees Celsius.
iii. Diethyl ether and ethyl alcohol are also soluble in pyrophosphoric acid.
- Polymorphs are formed when they crystallize.
- Extremely soluble in cold water, forming phosphoric acid slowly; decomposes much faster in hot water; soluble in alcohol and ether.
Pyrophosphoric Acid: Chemical Properties
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A compound's chemical properties can be defined as the characteristics of the substance quantified or seen during a chemical reaction in which the molecule's nature or chemical composition is changed. Reactivity with the other chemicals, toxicity, coordination number, flammability, enthalpy of formation, heat of combustion, oxidation states, and chemical stability are all chemical properties. ‘
Following are some of the chemical properties of pyrophosphoric acid:
| Particulars | Description |
|---|---|
| Compound Molecular Weight | 177.973 g/mol |
| Conjugate Base | Phosphoric Acid |
| Conjugate Acid | Diphosphate |
| Hydrogen Bond Donors | 4 |
| Hydrogen Bond Acceptors | 7 |
| Rotatable Bonds | 2 |
| Covalently Linked Unit | 1 |
| Complexity | 147 |
| Conversion with Boiling Water | Gets converted to Orthophosphoric Acid: H4P2O7 + H2O →2H3PO4 |
| Conversion on High Temperature | Gets converted to Metaphosphoric Acid: H4P2O7 → 2ΗPO3 + H2O |
Pyrophosphoric Acid: Hazards and Dangers
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- Accidental eating of the substance could be deadly; animal studies show that ingesting less than 150 grams of the substance can be fatal or cause major health problems.
- Following consumption, the substance can cause chemical burns in the oral cavity and gastrointestinal tract.
- Acidic corrosives can cause burns around the mouth, throat, and esophagus if consumed.
- Direct contact with the material might cause chemical burns to the eyes. Vapors and mists can cause significant eye injury.
- Skin contact with acidic corrosives would result in discomfort and burns; they may be severe with distinct edges and may recover slowly with the creation of scar tissue.
- Some people may get respiratory discomfort as a result of the substance. The body's reaction to discomfort might exacerbate lung damage.
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Pyrophosphoric Acid: Uses
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- Catalyst for the production of organic phosphate esters, metal treatment, and organic peroxide stabilizer.
- The vanadyl pyrophosphate methoxide cluster anion can be made with pyrophosphoric acid. Because of its capacity to form complexes, this acid is employed in anion binding of inorganic phosphates.
- Pyrophosphoric acid is a radiopharmaceutical that is used to examine bone and cardiovascular abnormalities. It is also found in some medications that help prevent iron deficiency anemia.
Things to Remember
- Pyrophosphoric acid is a chemical compound that is an anhydride of acrylic phosphorus acid. It is made up of two conjugated phosphoric acid molecules. The conjugate of this chemical molecule is an acid.
- In 1827, Mr. Clarke of Glasgow invented Pyrophosphoric Acid, which has chemical nature and is a hygroscopic substance. A hygroscopic substance is one that has the ability to absorb or adsorb water and retain it.
- Pyrophosphoric acid is a pyrophosphoric acid conjugate base and a diphosphate conjugate acid chemical compound. The chemical compound is also known as diphosphoric acid. The chemical formula for pyrophosphoric acid is: H4P2O7.
- There are two basic techniques for the commercial production of the chemical molecule (pyrophosphoric acid). The first method for large-scale commercial production of the chemical is the ion exchange process from sodium pyrophosphate.
- By passing a watery solution of sodium pyrophosphate, Na4P2O7, through an adequate cation exchange column, an acid solution in pure form can be obtained. The second most often used method is to treat lead pyrophosphate with hydrogen sulphide.
- The IUPAC designation for the chemical is phosphono dihydrogen phosphate. Other common names for the compound include: Diphosphoric acid, Pyrophosphoric acid and Phosphonooxy Phosphonic acid.
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Sample Questions
Ques. What are pyrophosphates, and what are they used for? (3 marks)
Ans. Pyrophosphates are the anion, salts, and esters of pyrophosphoric acid. Pyrophosphates are usually colorless or white. The alkali metal salts are soluble in water. They are effective complexing agents for metal ions (including calcium and many transition metals) and have a wide range of applications in industrial chemistry. The polyphosphate pyrophosphate is the first member of a family of polyphosphates.
Ques. What is the phosphorus oxidation number in Pyrophosphoric acid? (3 marks)
Ans. The phosphorus oxidation number in Pyrophosphoric acid is +5. The oxidation number is the total number of electrons that an atom gets or loses in order to form a chemical bond with another atom. Pyrophosphoric acid has the formula H4P2O7 and is a tetraprotic acid. Pyrophosphoric acid is a kind of phosphoric acid.
Assume that the phosphorus oxidation state is x.
(4 x 1 + (-2) x 7+2x)=0
2x=10
x=+5
Ques. Draw and explain the structure of pyrophosphoric acid. (3 marks)
Ans. Molecular formula of pyrophosphoric acid, which is H4P2O7, must be remembered in order to draw the structure of pyrophosphoric acid.
Pyrophosphoric Acid
Pyrophosphoric acid, commonly known as diphosphoric acid, is a medium-strength inorganic acid. Two phosphates engage with 4 hydroxyl (-OH) groups, which can contribute protons (-H) in aqueous solution, as seen in the structure. The agent, according to Arrhenius, provides protons (-H) in an acidic aqueous solution. Because of its ability to give four protons in aqueous conditions, pyrophosphoric acid has a medium strong acidic character. Pyrophosphoric acid is highly corrosive.
Ques. What is Pyrophosphoric acid? (3 marks)
Ans. Pyrophosphoric acid is an anhydride of acrylic phosphorus acid and is a chemical substance. It is made up of two phosphoric acid molecules conjugated together. This chemical compound's conjugate is an acid. The chemical compound is found in nature as a colorless, odorless substance. Pyrophosphoric acid is a hygroscopic material, according to its chemical nature. Pyrophosphoric acid has the chemical formula H4P2O7.
Ques. What are the various methods of preparing Pyrophosphoric acid? (3 marks)
Ans. Pyrophosphoric acid can be prepared through many ways i.e. commercial ways are different while it can be prepared in lab also under controlled reactions.
2H3PO4 → H4P2O7 + H2O
This acid can be made by passing dry gaseous hydrogen chloride through crystals of disodium phosphate. If there is a surplus of hydrogen chloride in the mixture, it can be removed by boiling it until it is completely depleted of hydrogen chloride. When orthophosphoric acid is heated for a long time, especially over 180° C, it dehydrates and produces pyrophosphoric acid (H4P2O7).
Ion exchange can be used to obtain the acid solution in pure form by passing a watery solution of sodium pyrophosphate, Na4P2O7, through an appropriate cation exchange column. The treatment of lead pyrophosphate with hydrogen sulphide also produces Pyrophosphoric acid.
Ques. What are the Physical Properties of Pyrophosphoric Acid? (3 marks)
Ans. Following are the physical properties of pyrophosphoric acid:
- Pyrophosphoric Acid 's physical state is defined as solid.
- Diethyl ether and ethyl alcohol are soluble in pyrophosphoric acid.
- Polymorphs are formed when they crystallize.
- Pyrophosphoric acid has a melting point of 71.5 degrees Celsius.
- Extremely soluble in cold water, forming phosphoric acid slowly; decomposes much faster in hot water; soluble in alcohol and ether.
Ques. What are the Chemical Properties of Pyrophosphoric Acid? (3 marks)
Ans. The following are some of the chemical properties of pyrophosphoric acid:
- H4O7P2 is the chemical formula for pyrophosphoric acid.
- The compound's molecular weight is 177.973 g/mol.
- The number of hydrogen bond donors is 4.
- The number of hydrogen bond acceptors is 7.
- In the chemical molecule, the number of rotatable bonds is 2.
Ques. What are the Hazardous effects of Pyrophosphoric acid? (3 marks)
Ans. Swallowing less than 150 grams of the drug can be lethal or cause serious health problems. The drug can induce chemical burns in the oral cavity and gastrointestinal tract after intake. If ingested, acidic corrosives can cause burns to the mouth, throat, and esophagus.
Chemical burns to the eyes could result from direct contact with the substance. Vapors and mists can be quite irritating. When this material comes into contact with the eyes, it causes serious eye damage. Chemical burns can occur when the material comes into direct contact with the skin. Contact with acidic corrosives on the skin causes irritation and burns.
Ques. What are the uses of Pyrophosphoric acid? (2 marks)
Ans. Catalyst for organic phosphate esters synthesis, metal treatment, and organic peroxide stabilization. Pyrophosphoric acid is a radiopharmaceutical that is used to look for abnormalities in the bones and the heart. Some drugs that help prevent iron deficiency anemia contain it as well. Pyrophosphoric acid can be used to make the vanadyl pyrophosphate methoxide cluster anion. This acid is used in anion binding of inorganic phosphates because of its ability to form complexes.
Ques. What is the melting point of Pyrophosphoric acid? (2 marks)
Ans. The melting point of Pyrophosphoric acid is 71.5 degrees Celsius. It is soluble in diethyl alcohol, ethyl alcohol and water. This anhydrous acid eventually crystallizes into 2 polymorphs i.e., the state of existence of a solid material into 1 or more forms as a crystal structure. This at the end melts at 54.3 degrees Celsius or 71.5 degrees Celsius.
Ques. What is the conjugate base of Pyrophosphoric acid? (2 marks)
Ans. The conjugate base of Pyrophosphoric acid is phosphorous acid. Pyrophosphoric acid is an anhydride of acrylic phosphorus acid and is a chemical substance. It is made up of two phosphoric acid molecules conjugated together. This chemical compound's conjugate is an acid. The chemical compound is found in nature as a colorless, odorless substance.
Ques. What are the numbers of P-OH, P = O and P - O - P bonds / moiety(ies) In a molecule of pyrophosphoric acid? (2 marks)
A) 4, 2 and 1
B) 4, 2 and 0
C) 3,3 and 3
D) 2, 4 and 1
Ans. Option A
Explanation:
Number of P – OH bonds = 4
Number of P = O bonds = 2
Number of P – O – P linkage = 1
Hence the answer is 4, 2, 1
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