Hydrogen Sulfide and Hydrosulfuric Acid

  1. In our chemistry class, we learned that an acid is a molecular compound that release hydrogen ions when they are dissolved in water through a process called ionization. So are both Hydrogen Sulfide (g) and Hydrosulfuric Acid (aq) acids?
     
  2. jcsd
  3. Borek

    Staff: Mentor

    If you ask me - that's a nitpicky question that doesn't have a definitive answer.

    Definition is not clear, as it doesn't specify how to treat potential acid - substance that WILL release H+ WHEN put in water, but it is not yet in water. You can argue that it is an acid (it will when) and that it is not an acid (it is not in water and it is not releasing H+). So it is semantics.

    Could be my English fails me. Second opinion won't hurt.

    --
     
  4. Char. Limit

    Char. Limit 1,986
    Gold Member

    They are the same substance...

    It's just that H2S is called Hydrosulfuric Acid when aqueous solution, and Hydrogen Sulfide otherwise.
     
  5. Its the same concept as Hydrogen Chloride gas. It could be an acid if it was aqueous.
     
  6. my friend please confirm from teacher that if H2S reacts with a base it forms a salt and water or not
     
  7. Borek

    Staff: Mentor

    Yes, it does.
     
  8. Char. Limit

    Char. Limit 1,986
    Gold Member

    Specifically, for a base Ca(OH)n, where Ca is any cation, the reaction proceeds as follows:

    n H2S + 2 Ca(OH)n --> 2n H2O + Ca2Sn

    I believe. So for NaOH it would be...

    2 NaOH + H2S --> 2 H2O + Na2S
     
    Last edited: Apr 11, 2010
  9. Borek

    Staff: Mentor

    Ca is a poor idea for any cation symbol, Me is much better.

    Formatting in your second equation went awry.
     
  10. Me looks like methyl; M is generally used
     
  11. Char. Limit

    Char. Limit 1,986
    Gold Member

    Fixed the format, and yeah, I should have done M.
     
  12. Borek

    Staff: Mentor

    Must be a matter of local convention, I am more than sure that I have books with Me in this room. But no doubts that you are right about possible confusion.

    --
    methods
     
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