This little website shows you the pH of various acids, bases, food products, bodily fluids, cleaners, and more!
Here's a random substance:
pH of Oxoglutaric Acid
Chemical formula: C5H6O5
Also known as: ketoglutaric acid
Oxoglutaric Acid is Acidic
At concentration of 1 mM, it has a pH of 3.09
At concentration of 10 mM, it has a pH of 2.36
At concentration of 100 mM, it has a pH of 1.77