3 replies to this topic

Hello, everybody. Recently i checked the pH for the following chemical mixture by using digital pH sensor and found that ZERO pH shown by the sensor. Is that possible? Why?

Chemical mixture:

DI water, 5000 ml
Potassium permanganate, KMnO4, 2100 ml
Ammonium Fluoride, NH4F, 5600 ml
Phosphoric Acid, H3PO4, 2800 ml
Bayowet, 16 ml


Thank you:-)

[gvdlans]

I did not check your composition, but in principle it is possible to have a pH=0 (or even a negative value...):

pH = - log [H+]

therefore, [H+] = 10 ^ (-pH) mol/l

thus, when pH=0: [H+] = 10 ^ (-0) = 1 mol/l

gvdlans,


Thank you.

[Mr. pH]

gvdlans already told you why it is possible in general, but phosphoric acid is simply too weak for pH 0, so it was some experimental error.