Question

Represent ${\mathrm{HAuCl}}_4$using stock notation.

Answer 1

Stock notation:

1. Stock notation is a method in chemical nomenclature that uses a Roman numeral to represent the oxidation state of a major element in a compound or ion.
2. Using this method it is easier to understand the oxidation number of metals in compounds.

${\mathrm{HAuCl}}_4$:

1. The ${\mathrm{HAuCl}}_4$ is a neutral chemical in which the central atom is $\mathrm{Au}$, which is connected to hydrogen and a chlorine atom.
2. Let the oxidation number of $\mathrm{Au}$ be “x”.
3. Oxidation State of $\mathrm{Au}=$Valency of Hydrogen$+$Oxidation number of $\mathrm{Au}$$+$$4\times$Valency of Chlorine$\Rightarrow 0$
4. $0=+1+\mathrm{x}+4(-1),\mathrm{x}=+3$
5. Therefore, the Oxidation state of$\mathrm{Au}=+3$, Stock notation is $\mathrm{HAu}\left(\mathrm{III}\right){\mathrm{Cl}}_4$