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 Pimelic Acid
Chemical formula: C7H12O4
Also known as: heptanedioic acid
Pimelic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.77
At concentration of 10 mM, it has a pH of 3.25
At concentration of 100 mM, it has a pH of 2.74