Boric Acid Uses, Boric Acid as a Medicine, Properties, Structure (For CBSE, ICSE, IAS, NET, NRA 2022)

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Title: Boric Acid Uses (Word Count: 398)

What is Boric Acid?

  • Boric Acid is a monobasic Lewis acid of boron with a chemical formula .
  • It is an acid-containing four atoms of oxygen, one atom of phosphorus, and three atoms of hydrogen. It is also known as acidum boricum, hydrogen borate, boracic acid, and orthoboric acid. It is a weak acid and has antiviral, antifungal, and antiseptic properties.
  • It is soluble in water and does not have a smell. It exists as a colourless crystal or in a white powder form. We can prepare boric acid by reacting borax with hydrochloric acid. Wilhelm Homberg was the first to prepare boric acid from borax.

Boric Acid as a Medicine

  • Boric acid is widely used as an antiseptic for the treatment of minor cuts and burns. Furthermore, this compound is also used in medical dressings and salves. Very dilute solutions of boric acid can be used as an eyewash. Owing to its antibacterial properties, boric acid can also be used for the treatment of acne in humans. In its powdered form, it can also be sprinkled into socks and shoes to prevent athlete՚s foot (tinea pedis) .
  • It is important to note that boric acid can prove poisonous if consumed or inhaled in relatively large quantities. Furthermore, continued exposure to boric acid over long durations of time can severely damage the kidney.

Preparation of Boric Acid

One of the simplest methods of preparing boric acid is by reacting borax with any mineral acid (hydrochloric acid, for instance) . The chemical equation for this reaction can be written as:

Boric acid can also be prepared from the hydrolysis of diborane and trihalides of boron (such as boron trichloride or boron trifluoride) .

Properties of Boric Acid –

Properties of Boric Acid
Boric Acid
Molecular weight/Molar Mass
Density
Boiling Point
Melting Point
  • Under standard conditions for temperature and pressure (STP) , boric acid exists as a white, crystalline solid that is fairly soluble in water.
  • The solubility of in water is temperature-dependent. At a temperature of 25 degrees Celsius, the solubility of boric acid in water is 57 grams per litre. However, when the water is heated to 100 degrees Celsius, the solubility of this compound increases to approximately 275 grams per litre.
  • It can also be noted that boric acid is sparingly soluble in pyridine and slightly soluble in acetone. The conjugate base of boric acid is the borate anion.

Structure of Boric Acid

Each boric acid molecule features boron-oxygen single bonds. The boron atom occupies the central position and is linked to three hydroxide groups. The overall molecular geometry of boric acid is trigonal planar. The structure of molecules is illustrated below.

Structure of Boric Acid

Structure of Boric acid

Boric Acid Uses

The uses of boric acid are listed below.

  • It is used in the manufacture of textile fiberglass
  • It is used in the production of the flat panel display
  • It is used to neutralize the active hydrofluoric acid
  • It is used by blacksmiths as welding flux
  • It is used in electroplating
  • It is used in the jewelry industry
  • It is used in the manufacture of silly putty
  • It is used as an Insecticidal
  • It is used as an antiseptic and antibacterial
  • It is used on carrom boards as a dry lubricant
  • It is used as a neutron poison in some nuclear plants
  • It is used to preserve grains like wheat and rice

Questions

What is the Other Name of Boric Acid?

Ans: Acidum boricum.

Write the Chemical Formula for Boric Acid

Ans:

What is the Molecular Mass of Boric Acid?

Ans: g/mol

Write the Boiling and Melting Point of Boric Acid

Ans: Boiling point , melting point

List Two Uses of Boric Acid

Ans: It is used as an antiseptic or neutron absorber.

What is Boric Acid Used For?

Answer:

Boric acid is also used in many chemical products as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor.

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