Hydrogen sulfide (H2S) is a colorless toxic gas. In its Lewis structure, there are two hydrogen atoms on both sides of the central sulfur atom. Around the sulfur atom, there are also two lone pairs. H2S forms hydro-sulfuric acid when dissolved in water.


H2S Lewis Structure- Key Points

Hydrogen sulfide is a colorless toxic gasIt emanates from sewers and as a by-product of industrial processesIn low concentrations, it smells like rotten eggsIt is highly explosive and only requires a concentration of 4% for a flash fire when exposed to a relatively cool heat source of 232 Degree CelsiusIt is heavier and 1.136 times denser than air. This means it is likely to be found in low-lying areas with little to no ventilationH2S is a polar molecule

Molar Mass of H2S

Molar mass of H = 1.00794 g/molSulfur molar mass = 32.06 g/mol Molar mass of H2S is 34.1g/mol

Uses of Hydrogen Sulfide

It is the main precursor for elemental Sulfur.It plays a vital role in signaling pathways in the human body.Farmers use Hydrogen sulfide as an agricultural disinfectant and it is found in some cutting oils, which are coolants and lubricants designed specifically for metalworking and machining processes.

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h2s polar or nonpolar?

H2S is a slightly polar molecule because of the small difference in electronegativity values of Hydrogen (2.2) atoms Sulfur (2.58) atoms.The molecular geometry of Hydrogen sulfide is polar but the bonds are not polar.Polarity is determined by electronegativity. A molecule is polar if the structure of that molecule is not symmetric.In the case of symmetric structure, the dipole vectors on each molecule cancel each other, resulting in the nonpolar nature of the molecule.In addition, the presence of two lone pairs that are on the opposite side of the two Hydrogen atoms also makes the molecule more polar and causes bent shape geometrical structure of H2S.A detailed explanation can be found at the link “h2s polar or nonpolar“.


To summarize everything in this article, the following are some important points:

The bond angle is 92.1 degrees and there are 8 valence electrons.H2S is a polar molecule with bent geometry.Exposure to Hydrogen sulfide can be dangerous.

Frequently Asked Questions (FAQs)

Some of frequently asked questions are given below

1. What is Polarity?

The distribution ofelectrical chargeover theatomsjoined by the bond causes polarity.Specifically, it is found that bonds between atoms of different elements are electrically inequivalent. For instance, in hydrogen chloride, the H atom is slightly positively charged whereas the Cl atom is slightly negatively charged.The slight electrical charges on dissimilar atoms are called partial charges, and the presence of partial charges signifies the occurrence of a polar bond.Some examples of polar molecules are Water(H2O),Ethanol,Ammonia,andSO2(Sulfur Dioxide).

2. Explain Hydrogen sulfide Lewis Structure in simple words

Hydrogen sulfide is a polar molecule with a single bond between two hydrogen and sulfur atoms. The structure is a bent structure with bond angles of 92.1 degrees.

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3. H2S is acid or base?

In its gaseous form, H2S is neither acidic nor basic, i.e. it is neutral, but when it is made into an aqueous solution, it releases the hydronium ions H+ and S2- ions.

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