# How to write the name of Hau3+ ion using stock notation. For example HAuCl4 is written as.......(lll) chroride. Fill the blank space?

Sep 28, 2017

See explanation

#### Explanation:

To explain this better I'll use reversible reactions.

You think that:
${\text{HAuCl"_(4(aq)) rightleftharpoons "HAu"_((aq))^(3+)+4"Cl}}_{\left(a q\right)}^{-}$

${\text{HAuCl"_(4(aq)) rightleftharpoons "H"_((aq))^(+)+"AuCl}}_{4 \left(a q\right)}^{-}$
${\text{HAuCl}}_{4 \left(a q\right)}$ is an acid (chloroauric acid), so the hydrogen ion dissociates from the rest of the molecule. A clearer explanation is brought on with the diagram for the acid structure:
So, there is no ${\text{HAu}}_{\left(a q\right)}^{3 +}$ ion, but there is a ${\text{AuCl}}_{4 \left(a q\right)}^{-}$ ion, called tetrachloroaurate:
By the way, the only compound I know fitting the name of _(III) chloride, is Gold(III) chloride (${\text{Au"_2"Cl}}_{6}$)