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 Glocolic Acid
Chemical formula: C2H4O3
Also known as: hydroxyacetic acid
Glocolic 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 2.94
At concentration of 100 mM, it has a pH of 2.42