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Gold has always been a highly prized metal, widely used from the beginning of history as a store of value. It doesn\'t rust like iron and doesn\'t become tarnished like silver. It is so chemically inert that it won\'t react even with the strongest concentrated acids. But it can be dissolved in aqua regia – a fresh-prepared mixture of concentrated HNO3 and HCl (1:3). When Germany invaded Denmark in World War II, the Hungarian chemist George de Hevesy dissolved the gold Nobel Prizes of Max von Laue and James Franck in aqua regia to prevent the Nazis from stealing them. He placed the jar with the solution on a shelf in his laboratory, and after the war, precipitated the gold out of the acid and returned it to the Royal Swedish Academy of Sciences and the Nobel Foundation who recast the medals and again presented them to Laue and Franck. The unbalanced equation for the reaction of gold with aqua regia is given below. Add the stoichiometric coefficients to the equation to balance it.Au(s)+HNO3(aq)+HCl(aq)--> HAUCl4(aq)+NO2(g)+H20(l)What's the function of HCL?

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Answer:

1Au(s) + 3HNO₃(aq) + 4HCl(aq) → 1HAuCl₄(aq) + 3NO₂(g) + 3H₂O(l)

The function of HCl is oxidize the gold.

Explanation:

It is possible to balance the reaction seeing each compound as a variable and take an equation for each atom, thus:

Au(s) + HNO₃(aq) + HCl(aq) → HAuCl₄(aq) + NO₂(g) + H₂O(l)

a       +       b         +      c      =        d            +    e       +    f

Au: a = d (1)

H: b + c = d + 2f (2)

N: b = e (3)

O: 3b = 2e + f (4)

Cl = c = 4d (5)

Assuming a = 1:

1 = d (1)

c = 4 (5)

b + 3 = 2f (2)

3b = 2e + f (4)

As b = e:

b = f (4)

f = 3; b = 3; e = 3

Thus, balanced reaction is:

1Au(s) + 3HNO₃(aq) + 4HCl(aq) → 1HAuCl₄(aq) + 3NO₂(g) + 3H₂O(l)

The function of HCl is oxidize the gold that before reaction is Au⁰ and afte ris Au⁺³

I hope it helps!

The balanced equation of gold and aqua regia is,  [tex]\rm Au+3\;HNO_3+4\;HCl\;\rightarrow\;HAuCl_4+3\;NO_2+3\;H_2O[/tex]. The HCl in the aqua regia provides the anions in the reaction.

What is the reaction of gold and aqua regia?

Gold is the inert nature element with the ability to form the hydrogen compounds. The reaction of gold with aqua regia resulted in the formation of gold chlorate.

The reaction of gold and aqua regia can be given as:

[tex]\rm Au+HNO_3+HCl\;\rightarrow\;HAuCl_4+NO_2+H_2O[/tex]

The balanced chemical equation has equal number of atom of each element on the product and reactant side. The balanced chemical reaction of gold and aqua regia is given as:

[tex]\rm Au+3\;HNO_3+4\;HCl\;\rightarrow\;HAuCl_4+3\;NO_2+3\;H_2O[/tex]

The reaction of gold and nitric acid of aqua regia results in the oxidation of the gold and the formation of gold ions.

The hydrochloric acid in the aqua regia provides the chloride anions for the reaction of gold cations, and the formation of the compound.

The recovery of the gold from the compound is mediated with the reduction reaction.

Learn more about aqua regia, here:

https://brainly.com/question/1128484

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