Does HBr Polar or Nonpolar?

A diatomic molecule, hydrogen bromide is a chemical compound with the chemical formula HBr. In nature, it is a colourless, odourless, and acidic chemical. Many of you may be unsure about hydrogen bromide’s polarity (HBr). To that end, I’m going to answer this question and clear up any lingering questions you may have, as well as touch on related themes.

So, is HBr polar or nonpolar? A polar molecule, HBr (Hydrogen Bromide) is due to the hydrogen and bromine atoms’ uneven electronegativities. Because the electronegativity of bromine is higher than that of hydrogen, an electron-bonding pair is drawn to the bromine atom more strongly, resulting in HBr being a polar molecule with a net dipole moment.

Hydroxylamine (HBr) dissolves quickly in water. A solution of an acid and water is what it is. Hydrogen bromide in water is saturated at 68.85 percent HBr by weight at normal temperature.

Inorganic and organic bromine compounds are synthesised primarily from this chemical component.

It is a potent acid that is produced when bromine is dissolved in water and then evaporates. In nature, HBr is a stifling gas. It dissolves very quickly in water, making it easy to use. In addition, water quickly dissociates it.

If you come into contact with it, you’re going to get burned.

One hydrogen atom and one bromine atom make up the HBr molecule. Its molecular weight is 80.9119 g/mol, making HBr a heavy atom to hold together.

Hydrogen has an electronegativity of 2.2, while bromine has a value of 2.96. A chemical bond’s polarity is caused by the electronegativity difference between the two atoms that create it.

One of the atoms obtains partial negative charge while the other acquires partial positive charge because the bonded electron pair is more attracted to the more electronegative atom.

When it comes to electronegativity, it’s all about how powerful an electron can be attracted to an atom by its electronegativity.

Which Molecules Are Polar and Which Are Nonpolar?

A molecule’s atoms are held in place by external forces. These bonding forces can be ionic, covalent, hydrogen bond, and metallic.

The strongest of them are the ionic and covalent bonding.

The ionic bond is produced when two molecules with opposite charges come together to form a single molecule. The electrostatic forces that exist between these atoms cause them to be drawn together.

When two atoms share electrons in order to stabilise each other, they establish a covalent connection.

The same amount of charge is shared by both atoms in a covalent bond with identical electronegativity. It signifies that both atoms have the same charge distribution.

When the electronegativity of the covalently bound atoms differs. It gets some of its own negative charge as a result of drawing the bound electron pair toward it more strongly.

While the atom with a lower electronegativity gets a partial positive charge, the other atom does not.

polar molecules have nonzero dipole moments because of this. HCl, HBr, and NH3 are examples of such chemical compounds. Check out the rationale for the polarity of Ammonia’s polarity.

Nonpolar molecules, on the other hand, have a dipole moment of zero. The electron pairs of these atoms are connected with equal force. CO2 and H2 are examples of nonpolar chemicals.

The following article discusses H2’s non-polarity.

Similarly, polar and nonpolar substances exhibit uneven geometrical shapes.

HBr is a polar molecule for a reason.

For example, the hydrogen and bromine atoms in the HBHr molecular structure have very different electronegativity values.

Bromine’s electronegativity is 2.96, while hydrogen’s is 2.2. Since the electronegativity of these two atoms differs, the bromine atom tends to draw the bound electron closer to it.

This causes the bromine atom to be negatively charged, and the hydrogen atom to be positively charged because of this.

There is an uneven charge distribution between hydrogen and bromide atoms in a hydrogen bromide molecule. It signifies that the bromine atom has a larger share of bound electrons. “

H-Br is polarised because of the covalent bond, which causes polarity.

The dipole moment of the HBr molecule is nonzero because of its polarity.

A chemical compound’s dipole moment is a measure of its polarity. The more polarity a molecule has, the larger its dipole moment.

How to check a compound’s polarity

The polarity of a molecule can be determined through a variety of means. These are described in the following.

This term refers to the ability of an atom to draw bound electrons toward it. Electronegativity: This means that the more an atom’s electronegativity increases, the stronger its ability to attract and retain electrons.

As a result, polar bonds are created when two atoms have different electronegativity. The electronegativity differential between the atoms that make up a molecule is exactly proportional to its polarity.

A chemical compound’s polarity can be gauged by its dipole moment. Calculated by multiplying the atoms’ charges by the difference between the charges on the atoms.

The dipole moment of a molecule is directly related to its polarity. The HBr molecule has a dipole moment of around 2.610 30Cm.

Molecular polarity is largely determined by its geometrical shape, which is a critical consideration.

A net dipole moment is produced by the asymmetrical form of the polar molecule. The nonpolar molecule, on the other hand, has no dipole moment and is symmetrical in shape.

HBr, on the other hand, has a linear structure due to the fact that it is made up of molecules with two atoms.

In the diagram below, you can see the HBr molecule’s molecular structure.

Making Hydrogen Bromide through the Process of Synthesis

The HBr molecule can be made in the lab in a variety of ways by distilling a potassium bromide solution with sulfuric acid.

In the case of this procedure, the reaction is as follows.

(sulphuric acid)+KBr = KHSO4 + HBr + H2SO4

The bromination of tetralin can also produce this acid, which is similar to the technique outlined above.

4Br2 — C10H8Br4 + C10H8Br4 — C10H12

The reduction of bromine in the presence of phosphoric acid is another technique of generating hydrobromic acid.

(phosphoric acid) ——-> Br2 + H3PO3 + H2O H3PO4 and 2HBr

HBr’s characteristics

It appears to be a colourless gas.

It’s water-soluble, so that’s good news.

The HBr molecule has a density of around 1.49 g/cm3.

The hydrogen bromide molecule has a molecular mass of 80.9119 g/mol.

HBr has a melting point of 86.9 °C, or 124.4 °F.

According to the calculations, HBr has a boiling point of around 66.7 degrees Celsius (88.2 degrees Fahrenheit).

At room temperature, it emits a noxious stench.

HBr’s Many Uses

It is utilised in a wide range of organic reactions as a catalyst and a reagent.

As a result, the Anhydrous hydrobromic acid must be transported in high-pressure cylinders.

It also serves as a transitional substance.

It is used extensively in the production of disinfectants and sanitizers.


Due to its higher electronegative charge in HBr’s molecular structure, bromine obtains partial negative charge whereas hydrogen gains partial positive charge because it attracts more electron pairs to itself.

The HBr molecule develops polarity and a non-zero dipole moment value as a result of its unequal charge distribution.

If you have any queries about the polarity of HBr, please feel free to post them in the comments area below. We’ll get back to you as soon as we can.

Read more: A review of ClO4’s atomic and molecular structure as well as its polarity

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


Please enter your comment!
Please enter your name here

Read More