The reaction between zinc (Zn) and aqueous sodium hydroxide (NaOH) is a bit more complex than a simple double displacement reaction. Here's the breakdown:

The Reaction:

Zinc reacts with a concentrated solution of sodium hydroxide to produce sodium zincate (Na₂ZnO₂) and hydrogen gas (H₂).

Balanced Chemical Equation:

```

Zn(s) + 2 NaOH(aq) + 2 H₂O(l) → Na₂ZnO₂(aq) + 2 H₂(g)

```

Explanation:

1. Zinc and Hydroxide Ions: Zinc reacts with hydroxide ions (OH⁻) from the sodium hydroxide solution.

2. Formation of Sodium Zincate: The reaction forms sodium zincate (Na₂ZnO₂), a soluble salt.

3. Hydrogen Gas Evolution: The reaction also produces hydrogen gas (H₂) as a byproduct.

Note:

* The reaction requires a concentrated NaOH solution.

* Zinc oxide (ZnO) can also be formed as a byproduct, but this is less common than sodium zincate.

Let me know if you have any further questions.