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 Itaconic Acid
Chemical formula: C5H6O4
Also known as: methylenesuccinic acid
Itaconic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.5
At concentration of 10 mM, it has a pH of 2.95
At concentration of 100 mM, it has a pH of 2.43