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Is hydrogen sulphide a polar compound?

  1. Nov 26, 2011 #1
    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.
     
  2. jcsd
  3. Dec 1, 2011 #2
    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.
     
  4. Dec 1, 2011 #3
    alright, got it! thanks
     
  5. Dec 2, 2011 #4

    DrDu

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    Science Advisor

    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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