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 Acetic Acid
Chemical formula: C2H4O2
Also known as: ethanoic acid, Hydrogen acetate, Methanecarboxylic acid
Acetic Acid is Acidic
At concentration of 1 mM, it has a pH of 3.91
At concentration of 10 mM, it has a pH of 3.39
At concentration of 100 mM, it has a pH of 2.88
At concentration of N, it has a pH of 2.4