Question

Is ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$ a Base?

Answer 1

1. ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$ is an oxidizing agent.
2. A chemical called acid is nothing more than a substance that, according to Arrhenius' principle, dissociates to produce hydrogen ions when broken down in the water.
3. Hydrochloric acid (HCl), sulfuric acid (${\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{4}}$), and nitric acid (${\mathbf{HNO}}_{\mathbf{3}}$) are some examples of Arrhenius acids.
4. According to Arrhenius thought, a chemical that dissociates to produce a hydroxyl ion when broken down in the water is called a base.
5. Sodium hydroxide ($\mathbf{NaOH}$), calcium hydroxide ($\mathbf{Ca}{\mathbf{\left(}\mathbf{OH}\mathbf{\right)}}_{\mathbf{2}}$), and other hydroxides are examples of Arrhenius bases.
6. The hydrogen dichromate$\left({\mathbf{H}}_{\mathbf{2}}{\mathbf{Cr}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{7}}\right)$, which can transfer protons, is acidic according to the Arrhenius view.
7. Due to its ability to accept protons, the dichromate ion ${\mathbf{Cr}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{7}}$ serves as the conjugate base of hydrogen dichromate.
8. The following chemical reaction is related to the above topic,

${\mathrm{H}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\left(\mathrm{aq}\right)\to {\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\left(\mathrm{aq}\right)+2{\mathrm{H}}^{+}\left(\mathrm{aq}\right)$

Considering the above argument, we conclude that ${\mathbf{Cr}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{7}}$ is a base.

Hence, ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$ a base.