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 Valeric Acid
Chemical formula: C5H10O2
Also known as: pentanoic acid
Valeric Acid is Acidic
At concentration of 1 mM, it has a pH of 3.95
At concentration of 10 mM, it has a pH of 3.43
At concentration of 100 mM, it has a pH of 2.92