The reaction between sodium hydride (NaH) and hydrogen sulfide (H₂S) is a metathesis reaction, also known as a double displacement reaction. This reaction results in the formation of sodium sulfide (Na₂S) and hydrogen gas (H₂).

Here's the balanced chemical equation:

2 NaH + H₂S → Na₂S + 2 H₂

Explanation:

* Sodium hydride (NaH) is a strong base, and hydrogen sulfide (H₂S) is a weak acid.

* The reaction proceeds by the transfer of a proton (H⁺) from hydrogen sulfide to the hydride ion (H⁻) of sodium hydride.

* The resulting sodium sulfide (Na₂S) is a salt, while hydrogen gas (H₂) is released as a byproduct.

Important Note:

* This reaction is highly exothermic, meaning it releases a significant amount of heat.

* It is essential to carry out this reaction with caution in a well-ventilated area and under proper safety measures due to the flammable nature of hydrogen gas.