The product of the reaction between water and a nonmetal oxide is an acid.

Here's why:

* Nonmetal oxides are acidic oxides. This means they react with water to form acids.

* Water acts as a base in this reaction.

Example:

The reaction of sulfur dioxide (SO₂) with water produces sulfurous acid (H₂SO₃):

SO₂ (g) + H₂O (l) → H₂SO₃ (aq)

General Reaction:

Nonmetal oxide (X₂Oₙ) + Water (H₂O) → Acid (HₓXOₙ)

Note:

* The specific acid formed depends on the nonmetal oxide used.

* Some nonmetal oxides, like carbon dioxide (CO₂), can react with water to form weak acids (carbonic acid, H₂CO₃).