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 Pivalic Acid
Chemical formula: C5H10O2
Also known as: dimethylpropanoic acid
Pivalic Acid is Acidic
At concentration of 1 mM, it has a pH of 4.04
At concentration of 10 mM, it has a pH of 3.52
At concentration of 100 mM, it has a pH of 3.02