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 Adipic Acid
Chemical formula: C6H10O4
Also known as: hexanediodic acid
Adipic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.74
At concentration of 10 mM, it has a pH of 3.22
At concentration of 100 mM, it has a pH of 2.71