Final answer:
H2SO4, also known as sulfuric acid, is the compound among the listed options that is an Arrhenius acid. It dissociates in water to yield hydrogen ions (H+), which is the hallmark of Arrhenius acids.
Step-by-step explanation:
To explain which of the given compounds is an Arrhenius acid, we need to identify the substance that increases the concentration of H+ ions (protons) when dissolved in water. According to the Arrhenius definition, an acid is a substance that dissociates in water to yield hydrogen ions, H+, while a base produces hydroxide ions, OH-.
Out of the options provided:
- NH2CH3 (methylamine) - Neither
- CH3CF3 (Trifluoromethane) - Neither
- NaOH (Sodium hydroxide) - Arrhenius Base
- H2SO4 (Sulfuric acid) - Arrhenius Acid
- KCl (Potassium chloride) - Neither
Among these compounds, H2SO4 is the one which is an Arrhenius acid; it is a strong acid that completely dissociates in water to release H+ ions.