Here's why:

* Amphiprotic: SLS has both acidic and basic properties. It can act as an acid by donating a proton (H+) from its sulfate group. It can also act as a base by accepting a proton from a strong acid.

* Salt: SLS is actually the sodium salt of lauryl sulfuric acid. This means it's formed by reacting lauryl sulfuric acid (an acid) with sodium hydroxide (a base). The resulting compound is essentially a salt, which is generally neutral in pH.

However, SLS solutions are typically slightly acidic (pH ~ 6). This is because the sulfate group can hydrolyze in water, releasing a small amount of hydrogen ions (H+).

In summary:

* SLS is amphiprotic, meaning it has both acidic and basic properties.

* It is a salt, which generally has a neutral pH.

* SLS solutions are slightly acidic due to hydrolysis of the sulfate group.