Question

1. which of the following shows the behavior of an arrhenius acid?

options:

• naoh → na⁺ + oh⁻
• nh₃ + h₂o → nh₄⁺ + oh⁻
• ca(clo₃)₂ → ca²⁺ + clo₃⁻
• hf → h⁺ + f⁻

Explanation:

An Arrhenius acid is defined as a substance that dissociates in water to produce hydrogen ions ($\ce{H+}$). Let's analyze each option:

• The first option ($\ce{NaOH -> Na+ + OH-}$) shows a base (produces $\ce{OH-}$) dissociating, not an acid.
• The second option ($\ce{NH3 + H2O -> NH4+ + OH-}$) is the reaction of a base (ammonia) with water to produce hydroxide ions, not an acid behavior.
• The third option ($\ce{Ca(ClO3)2 -> Ca^2+ + ClO3-}$) is the dissociation of a salt, not an acid.
• The fourth option ($\ce{HF -> H+ + F-}$) shows hydrofluoric acid dissociating to produce $\ce{H+}$ ions, which fits the definition of an Arrhenius acid.

Answer:

$\boldsymbol{\ce{HF -> H+ + F-}}$ (the option with this reaction)