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 Sulfuric Acid
Chemical formula: H2SO4
Also known as: Oil of vitriol
Sulfuric Acid is Strongly Acidic
At concentration of 1 mM, it has a pH of 2.75
At concentration of 10 mM, it has a pH of 1.87
At concentration of 100 mM, it has a pH of 1.01
At concentration of 0.01N, it has a pH of 2.1