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The Preparation And Properties Of Oxoacids

This article in whole includes the details on the keynotes on the preparation and properties of oxoacids. This article also covers a few other related topics like oxoacids of phosphorus and a few examples of it.

Modern chemical research has refuted Lavoisier’s acid-base reaction theory. Acids are classified into two categories: oxoacids and hydro acids, which include oxygen and hydrogen atoms, respectively. The molecular structure of oxyacid compounds is X – O – H. Here, X denotes the compound’s core atom. Its electronegative degree dictates the acid’s acidic intensity. As the number of oxygen atoms increases, electronegativity increases. Due to the instability of oxyacids, it is impossible to isolate the constituent elements. Sulphuric acid, phosphorous acid, and hypochlorous acid are all examples of oxoacids. 

Carboxylic acid is a type of acid. any of a group of chemical molecules that include a carboxyl functional group; any of these compounds (carbon with one double bond to an oxygen and a single bond to another oxygen, which is in turn is bonded to hydrogen).

Oxyacid acid, as opposed to hydracid, is an acid that contains oxygen (oxoacid).

Oxoacids (also known as oxyacids) are acids that contain oxygen in their composition. To be more precise, an oxoacid is an acid that does the following:

  • contains oxygen
  • contains at least one other element 
  • has at least one hydrogen atom linked to oxygen and 
  • is formed into an ion as a result of the loss of one or more protons in solution.

Oxoacids include the following:

  • Carboxylic acids
  • Sulfuric acid
  • Nitric acid
  • Phosphoric acid

Because all oxoacids contain acidic hydrogen linked to an oxygen atom, unlike binary nonmetal acids, the primary determining factor for an oxoacid’s relative strength is the central atom’s electronegativity (X), as well as the number of Oxygen atoms present around that central atom.

Oxoacids Of Phosphorus- 

Phosphorus is an example of an element that can be utilized to synthesize a variety of oxoacids. H3PO4, H3PO3, and other frequently occurring oxyacids In phosphorus oxoacids, the phosphorus atom is tetrahedrally surrounded by other atoms. It is self-evident that these acids have at least one P=O bond and one P–OH bond. Along with P=O and P–OH connections, phosphorus

oxoacids have P–P and P–H bonds. The phosphorus oxidation state is less than +5 in these conditions.

Phosphorus oxoacid (or phosphorus acid) is a generic term for any acid-containing phosphorus, oxygen, and hydrogen atoms in its molecule. Such molecules are theoretically limitless in quantity. Although some of them are unstable and have not been isolated, they are present in stable salts and esters as derived from anions and organic groups. The most important is the phosphoric acids, which are used in biology, geology, industry, and chemical research. Their esters and salts are called phosphates.

P-H bonds in oxoacids are not ionizable, resulting in the formation of H+ ions. On the other hand, H atoms linked to oxygen in the P-OH state are ionizable. As a result, we can state that basicity is a property of H atoms in combination with oxygen. Due to the presence of two P-OH bonds, phosphorus acid, H3PO3, is dibasic. Similarly, because of the presence of three P-OH bonds, phosphoric acid, H3PO4, is tribasic. Significant reducing powers are possessed by phosphorus oxoacids with P-H bonds. Hypo phosphorous acid is an excellent reducing agent due to its two P-H bonds.

Phosphorus acid: 

Phosphorus acid, H3PO3, is a diprotic acid. As a result, it ionizes two protons. It is more accurately represented by the structural formula HPO(OH)2. Phosphorous acid is formed when phosphorus trichloride is hydrolyzed with acid or steam.

Phosphoric acid: 

Phosphoric acid is a triprotic acid. This suggests that it is capable of ionizing three protons. It is a non-toxic acid in its purest form. It is present in solid-state at normal temperature and pressure. Phosphoric acid can be synthesized by reacting sulfuric acid with tri-calcium phosphate-

Hypophosphoric acid:

 Hypophosphoric acid is generated by executing a controlled oxidation of red phosphorus with sodium chlorite. After generating the acid’s disodium counterpart, it is passed through a cation exchanger to form hypophosphoric acid. The acid is naturally tetrabasic.

Pyro-phosphorous Acid (H4P2O5)-

Pyro-phosphorous acid is a defunct name for the first of two phosphonic acids with the formula H4P2O5 and P-O-P and P-P bridges.

Phosphorus has an oxidation state of +3 when combined with Pyro-phosphorus.

Pyro-phosphorous Acid Preparation-

When ortho-phosphorus acid is reacted with phosphorus trichloride, pyro-phosphoric acid is formed.

Utilization of Phosphorus Oxoacids

  • Phosphorus is utilized in the preparation of HI and HBr as a replacement for sulphuric acid.
  • It is used in the industry for manufacture of soft drinks as a souring agent.
  • It is used in the preparation of salts like phosphate salts of sodium, ammonium, and potassium.
  • It is a component of phosphatic fertilizers

CONCLUSION

Oxoacid is an acidic substance composed of components connected chemically to hydrogen and oxygen. Phosphorus or halogens may be among these elements. They have variable degrees of acidity, and some are formed as intermediates in reversible chemical reactions.

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Which state does the phosphorus atom represent in its Oxyacids?

Ans. The phosphorus oxoacids are classified according to the oxidation state(s...Read full

How is Hypophosphoric Acid obtained?

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Which phosphorus oxoacid is the most acidic?

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Which phosphorus oxyacids can operate as a reducing agent?

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Which phosphorus oxoacids are tribasic?

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