Nitrous Acid Lewis Structure: Drawing And Detailed Explanations

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The Lewis stricture for HNO2 (Nitrous acid) is drawn step by step using the total valence electrons of each element. There have been no charges on the atoms in the Lewis structure of nitrous acid, and one double bond exists between nitrogen and one oxygen atom.

  1. Nitrous Acid Lewis Structure
  2. Nitrous Acid Hybridization

HNO2, also known as nitrous acid, is a monoprotic acid (acids that donate one proton while dissociation). It’s a weak acid that only occurs in the form of nitrite salts in solution (NO2-).

The oxygen content of nitrous acid is lower than that of nitric acid (HNO3). Scheele found it, which is somewhat unstable in nature. It has a strong stench and looks as a light blue liquid.

Acidification of sodium nitrite and mineral acid produces nitrous acid. The product HNO2 is created in the reaction mixture itself, which is normally done at freezing temperatures.

Nitrous Acid can also be made by dissolving dinitrogen trioxide in water. The following is the reaction:

Preparation of HNO2

1. Nitrous Acid Lewis Structure:

The first and most crucial step in discovering several properties related to a molecule’s bonding is to create a Lewis structure.

As a result, anytime bonding is described in the context of a molecule or a compound, your mind should automatically leap to the Lewis structure of the substance in question.

Before we begin creating the Lewis structure for HNO2, there are a few things to bear in mind.

An atom’s valence electron count is represented by the Lewis structure. The number inscribed on top of a group’s column in a periodic table can be used to identify the number of valence electrons in that group. Around the atom, the valence electrons are shown as dots.

These electrons are positioned such that each atom’s octet is complete. This essentially implies that each atom should have 8 electrons surrounding it in order to establish stability.

The only exceptions are hydrogen and helium, which contain two electrons in their outermost shell and hence follow the duplet rule.

Let’s look at the stages involved in creating a Lewis diagram:

Step 1: We start by counting the molecule’s total number of valence electrons.

When we look at HNO2, we can see that it contains one valence electron, five valence electrons, and six valence electrons, with two atoms of O, for a total of 6×2 = 12 valence electrons.

As a result, the total number of valence electrons is 1+5+12 = 18 valence electrons when we add everything together.

Step 2: Now we’ll look at the second step, which is determining the compound’s core atom (one which has the highest number of bonding sites).

In the instance of HNO2, it’s important to remember that anytime H is connected to a polyatomic molecule (in this example, NO2), it’s always to one of the oxygen atoms.

As a result, the core atom is N, which has the most bonding sites and is less electronegative than O.

Step 3: To simulate a chemical link, we now place two valence electrons between each atom.

Step 4: The remaining valence electrons are now arranged such that each atom reaches its octet or duplet (H).

Step 5: If the atoms do not reach their octet form after these electrons have been arranged, the valence electrons are converted into a double or triple bond, giving each atom its whole octet.

As a last step, you may look at each atom’s formal charge. It should be as low as feasible, and the method below may be used to compute it.

Simple Structure of Nitrous acid from wikipedia

Let’s have a look at HNO2 now.

The total number of valence electrons is equal to 18.

N is the central atom.

We note that N is missing two valence electrons to complete its octet after arranging all 18 valence electrons around the molecule.

As a result, we complete each atom’s octet by using one pair of valence electrons from O to form a double bond with N. HNO2’s Lewis structure is now complete, and each atom’s formal charge is zero.

Any molecule’s Lewis structure may be determined using the techniques described above.

2. Nitrous Acid Hybridization:

The Hybridization of a molecule is the next step after learning the Lewis structure. Hybridization is the production of new hybrid orbitals that aid in determining the shape and characteristics of a molecule.

sp2 is the Hybridization of HNO2.

Hybridisation can be understood in two ways:

We may locate hybridization by comprehending the idea that underpins it. Hybridization is defined by adding the number of bonds and the centre atom’s lone pair.

Hybridization’s (H) value is as follows:

It is sp hybridised if H=2.

If H=3, sp2 has been hybridised.

H=4 indicates that it sp3 hybridised.

H=5 indicates that it sp3d hybridised.

H=6 denotes sp3d2 hybridization.

We know that N is the core element in HNO2. It has a lone pair and is linked to two oxygen atoms. As a result, the total (H) is 2+1=3, indicating that it is sp2 hybridised.

A formula for determining the hybridization of a molecule is also available.

The following is the formula for calculating hybridization:

H= 1/2[V+M-C+A]

C= Charge on cation or more electropositive atom, H= Hybridization, V= Number of Valence electrons, C= Charge on anion or more electropositive atom, and A= Charge on anion or more electropositive atom.

When we look at HNO2, we can observe that

V is equal to 5. (Valence electrons of the central atom N)

M = 1 The atom oxygen (O) is divalent. As a result, it isn’t counted. The only atom that is monovalent is H, which has only one atom.

The charge of a cation or anion will be zero since HNO2 is a neuronal molecule (overall charge is 0).



H=3 indicates that HNO2 has been hybridised with sp2. As a result, these two approaches may be used to find HNO2 hybridization.

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