While the reaction between an acid and a base can often produce fizzing due to the release of a gas, this doesn't always happen when an acid becomes neutral.

Here's why:

* Fizziness is caused by gas release: When an acid reacts with a base, the products are usually salt and water. If the reaction produces a gas (like carbon dioxide), you'll see fizzing.

* Not all acid-base reactions produce gas: Many acid-base reactions don't release a gas. For example, the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH) forms salt (NaCl) and water (H₂O), without any gas.

* Neutralization doesn't always mean fizzing: Neutralization simply means the acid and base have reacted to form a solution with a pH close to 7 (neutral). This can happen with or without the release of a gas.

Examples:

* Fizzing: Baking soda (sodium bicarbonate) reacting with vinegar (acetic acid) produces carbon dioxide gas, causing fizzing.

* No fizzing: Hydrochloric acid (HCl) reacting with sodium hydroxide (NaOH) produces salt (NaCl) and water (H₂O) without any gas release.

In summary: While some acid-base reactions cause fizzing due to gas release, neutralization itself doesn't always lead to fizzing. The reaction products determine whether or not a gas is produced.