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 Orthophosphoric Acid
Chemical formula: H3PO4
Orthophosphoric Acid is Strongly Acidic
At concentration of 1 mM, it has a pH of 3.06
At concentration of 10 mM, it has a pH of 2.26
At concentration of 100 mM, it has a pH of 1.63
At concentration of 0.1N, it has a pH of 1.5