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 Boric Acid
Chemical formula: H3BO3
Also known as: Orthoboric acid, Boracic acid, Sassolite, Optibor, Borofax, Trihydroxyborane, hydroxide, Boron Trihydroxide
Boric Acid is Mildly Acidic
At concentration of 1 mM, it has a pH of 6.12
At concentration of 10 mM, it has a pH of 5.62
At concentration of 100 mM, it has a pH of 5.12
At concentration of 0.1N, it has a pH of 5.3