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 P-toluic Acid
Chemical formula: C8H8O2
Also known as: para-toluic acid
P-toluic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.73
At concentration of 10 mM, it has a pH of 3.2
At concentration of 100 mM, it has a pH of 2.69