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Thread: can we have negative pH values!!!!!!!!!!

  1. #1 can we have negative pH values!!!!!!!!!! 
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    Hi, is it possible to have negative pH value? How do we calculate the 1) pH of 2 Molar HCl solution and 2) pH of 10-8 Molar HCl solution


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    Quote Originally Posted by chinna View Post
    Hi, is it possible to have negative pH value? How do we calculate the 1) pH of 2 Molar HCl solution and 2) pH of 10-8 Molar HCl solution
    Certainly. pH is - log10 [H+], so if [H+] is molar then pH is zero and anything stronger than this will be -ve.


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    Bullshit Intolerant PhDemon's Avatar
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    Exchemist beat me to it! It is, however, difficult to verify negative pH's experimentally. Thus article may be interesting to you. Negative pH - Is Negative pH Possible
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    Quote Originally Posted by PhDemon View Post
    Exchemist beat me to it! It is, however, difficult to verify negative pH's experimentally. Thus article may be interesting to you. Negative pH - Is Negative pH Possible
    Very nice article. Which shows, yet again, how one spends one's time in science, as in other fields, learning a set of rules - and then we find the interesting bit is why the rules don't always work!
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    Yeah, it's a good article that explains the basics well, I came across the site while preparing a lesson on acids and bases for a job interview. The "can pH be negative or greater than 14" is a common question and although I knew the concepts in the article it is nice to see them set out in an approachable way that makes sense to kids. (I can imagine this site saving me a lot of time next year in helping me to find simple ways to approach what can be difficult concepts to explain to someone without a chemistry background).
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    It's my understanding that the strongest pure Brønsted-Lowry acid is HSbF6 (there are stronger acids based on mixtures).

    Interestingly, SbF5 is such a potent Lewis acid and fluoride acceptor that not only does it enhance the acidity of HF, but it also enhances the oxidation potency of F2 (for reactions where the oxidation potency of F2 just isn't enough ).
    There are no paradoxes in relativity, just people's misunderstandings of it.
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