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 Cyclohexanecarboxylic Acid
Chemical formula: C7H12O2
Cyclohexanecarboxylic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.97
At concentration of 10 mM, it has a pH of 3.46
At concentration of 100 mM, it has a pH of 2.95