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 M-toluic Acid
Chemical formula: C8H8O2
Also known as: meta-toluic acid
M-toluic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.69
At concentration of 10 mM, it has a pH of 3.15
At concentration of 100 mM, it has a pH of 2.64