# Question 9d1d8

Oct 4, 2015

One option is manganese dioxide.

#### Explanation:

To be able to produce chlorine gas, ${\text{Cl}}_{2}$, from hydrochloric acid, $\text{HCl}$, you need to use an oxidizing agent capable of oxidizing chlorine from a $\textcolor{b l u e}{- 1}$ oxidation state, which it has in hydrochloric acid, to a $\textcolor{b l u e}{0}$ oxidation state, which it has in chlorine gas.

"H" stackrel(color(blue)(-1))("Cl") -> stackrel(color(blue)(0))("Cl"_2)#

One oxidizing agent that can help you get chlorine gas from hydrochloric acid is manganese dioxide, ${\text{MnO}}_{2}$.

${\text{MnO"_text(2(s]) + 4"HCl"_text((aq]) -> "MnCl"_text(2(aq]) + "Cl"_text(2(g]) uarr + 2"H"_2"O}}_{\textrm{\left(l\right]}}$