Using a pH meter calibrated with 1.68 and 4.01 buffer solutions, I'am reading a pH value of -0.40 for the 85% ortho-phosphoric acid. Is it possible?

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Leo Vleugels

Dear Aykut,

Good to see you used different calibration standards!

Please review my reply to your earlier question. Yes, it is possible and expected. The pH-scale pH = -log [H3O+], so if your proton concentration is 2.5 moles/liter your pH = - log(2.5) = - 0.40.

Kind regards, Leo

Richard Davis

If you have not seen it yet, this article from the Journal of Chemical Education might interest you. It is open-access from the publisher and has been viewed almost 30000 times: DOI: 10.1021/ed083p1465.

It is also available here:

Article Negative pH Does Exist