Zinc oxide (ZnO) is insoluble in water, which means water is not a solvent for it.

Here's a breakdown:

* Solvents are substances that dissolve other substances called solutes.

* Solubility refers to the ability of a solute to dissolve in a solvent.

Zinc oxide is more soluble in acids than in water. For example, it will dissolve in hydrochloric acid (HCl) to form zinc chloride (ZnCl2) and water.

Here's the chemical reaction:

ZnO + 2HCl → ZnCl2 + H2O

It is also slightly soluble in alkaline solutions, like strong bases like sodium hydroxide (NaOH).

So, while there isn't a single "solvent" for zinc oxide, it is best described as being soluble in acids and to a lesser extent, alkaline solutions.