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 Chromic Acid
Chemical formula: H2CrO4
Also known as: Dihydroxidodioxidochromium, Tetraoxochromic acid
Chromic Acid is Strongly Acidic
At concentration of 1 mM, it has a pH of 3.03
At concentration of 10 mM, it has a pH of 2.33
At concentration of 100 mM, it has a pH of 2.06