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 Oxaloacetic Acid
Chemical formula: C4H4O5
Also known as: oxalacetic acid
Oxaloacetic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.05
At concentration of 10 mM, it has a pH of 2.29
At concentration of 100 mM, it has a pH of 1.68