The pure form of water is NOT ____.

Pure water ($H_2O$) undergoes auto-ionization to produce equal concentrations of hydrogen ions ($H^{+}$) and hydroxyl ions ($OH^{-}$).

At a temperature of $298\text{ K}$, the concentration of both these ions is exactly $10^{-7}\text{ M}$, which corresponds to a $\text{pH}$ value of $7$. This means that pure water is completely neutral, being neither acidic nor basic.

Furthermore, water is classified as an inorganic compound because its molecular structure does not contain carbon-hydrogen covalent bonds, and it is chemically reactive rather than completely inert.

Since pure water is inherently neutral, it is not acidic.

Answer: acidic