Final answer:
LSD, also known as acid, is categorized as an acid based on its chemical properties and its ability to dissolve in water to yield hydronium ions following the Arrhenius definition.
Step-by-step explanation:
LSD, known as d-lysergic acid diethylamide, is categorized as an acid. It is synthesized from lysergic acid which is a compound derived from a rye fungus. The name itself includes the word 'acid', indicating its nature. Classic hallucinogens like LSD are potent mood-altering substances. LSD is able to dissolve in water, which is a characteristic of acids based on the Arrhenius definition that acids dissolve in water to yield hydrogen cations, or hydronium ions. In contrast, bases dissolve in water to produce hydroxide anions (OH−). Acids generally have a sour taste, can change the color of certain natural dyes such as turning litmus from blue to red, and react with substances like limestone to release CO2 gas. Bases, on the other hand, are substances that can neutralize acids.