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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Krasmi on April 13, 2007, 12:26:36 PM

Title: Concentration of ions
Post by: Krasmi on April 13, 2007, 12:26:36 PM

If we have 1M of sulphuric acid solution, there would be 1M of SO₄^2- ions and 2M of H⁺ ions.  Is that correct?

Title: Re: Concentration of ions
Post by: Dan on April 13, 2007, 01:26:44 PM

If dissociation was complete, then that would be correct. However, the second dissociation constant of sulfuric acid is five orders of magnitude lower than the first (pKa1 ~ -3, pKa2 ~ 2).

In other words, the

H⁺ + HSO₄^- <----> 2H⁺ + SO₄^2-

equilibrium lies further to the left.

Title: Re: Concentration of ions
Post by: Krasmi on April 13, 2007, 01:53:07 PM

Thank you.