Is hydrogen sulphide a polar compound?

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Discussion Overview

The discussion centers around whether hydrogen sulfide (H2S) is a polar compound and the implications of its polarity on intermolecular interactions, specifically dipole-dipole interactions versus induced dipole interactions. The scope includes conceptual understanding of molecular polarity and its effects on physical properties.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions the classification of H2S as a polar compound, suggesting that its V-shaped geometry implies it should exhibit dipole-dipole interactions.
  • Another participant argues that H2S is not very polar, noting the small electronegativity difference between sulfur and hydrogen, which leads to a weak dipole moment compared to water.
  • A different participant provides a specific dipole moment value for H2S, asserting that it is quite polar and that dipole-dipole interactions are significant, while also noting the absence of hydrogen bonding.

Areas of Agreement / Disagreement

Participants express differing views on the polarity of H2S, with some suggesting it is only slightly polar while others argue it is quite polar. The discussion remains unresolved regarding the strength of its dipole and the nature of its intermolecular interactions.

Contextual Notes

Participants reference electronegativity differences and molecular geometry but do not fully explore the implications of these factors on the classification of H2S. There is also a lack of consensus on the significance of dipole-dipole interactions versus induced dipole interactions.

mutineer
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I wanted to know whether H2S is a polar compound and hence does it have a dp dp interaction. An answer sheet says the H2S only has id-id. If this is true can some one explain it to me? cause sulphur is definitively polar, and considering h2s's V shape, it should be a polar molecule, thus having dipole interaction.
 
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Its not very polar at all. It doesn't exhibit strong hydrogen bonding like water does which is why its a gas instead of a liquid at room temperature. Take a look at the electronegativity scale:
pauling-scale.jpg

it has bent molecular geometry so you're right, it has a dipole, but as you can see sulfur and hydrogen only have an electronegativity difference of 0.38 so its not a very strong dipole. So to sum it up: H2S is only slightly polar.
 
alright, got it! thanks
 
Well, it has a dipole moment of 0.97 D as compared to 1.85 D of water. So it is quite polar and dipole dipole interactions are important. However, it doesn't form hydrogen bridges.
 

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