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 Hydrogen Cyanide
Chemical formula: HCN
Also known as: Formic anammonide, Hydrocyanic acid, Prussic acid, Methanenitrile
Hydrogen Cyanide is Acidic
At concentration of 1 mM, it has a pH of 6.11
At concentration of 10 mM, it has a pH of 5.62
At concentration of 100 mM, it has a pH of 5.12