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March 29, 2017

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At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct?

For a neutral, aqueous solution regardless of temperature.. would the only correct statement be [H+] = [OH-]?

pH = 7.00 and pOH = 7.00 would not be included for this when it is regardless of temperature right?

  • Chemistry - ,

    I'm a little confused by the wording. The first paragraph is true; i.e., at 25C H^+ = OH^- and pH = pOH = 7

    I don't intend to change the meaning of the last two paragraphs; however, I will write it another way that makes more sense to me. At some temperature other than 25C, a neutral soln will have H^+ = OH^- but pH is not 7 and pOH is not 7 although pH = pOH.

  • Chemistry - ,

    Yes! that is what I meant by the second paragraph. So at some other temperature [H+] = [OH-] is true but pH and pOH will not be 7?

  • Chemistry - ,

    That's right, BUT pH still will be = to pOH but ti won't be 7. For example, at s temperature of 0 C, Kw = .114E-14 which makes
    (H^+) = (OH^-) = sqrt Kw = 3.38E-8 so pH = 7.47 and pOH = 7.47.

  • Chemistry - ,

    I see now, THANKS!

  • Chemistry - ,

    okay... but can [H3O] = 1.0*10^-7 also be true for a neutral solution?

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