Gold has always been a highly prized metal, and it has been widely used from the beginning of history as a store of value. Itdoes not rust like iron and does not become tarnished like silver. It is so chemically inert that it will not react with even thestrongest concentrated acids. But it can be dissolved in aqua regia, a fresh-prepared mixture of concentrated HNO, and HCl ina 1:3 ratio.When Germany invaded Denmark in World War II, the Hungarian chemist George de Hevesy dissolved the gold Nobel Prizesof Max von Laue and James Franck in aqua regia to prevent the Nazis from stealing them. He placed the jar with the solutionon a shelf in his laboratory and, after the war, precipitated the gold from the acid solution and returned it to the Royal SwedishAcademy 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. Add the stoichiometric coefficients to the equationto balance it.equation:Au(s) + HNO, (aq) + HCI(aq)→ HAUCI,(aq) + NO,(g) + H,O(1)

Gold react with hydrogen chloride and nitric acid to produce hydrogen tetrachloridoaurate, nitrogen…

The unbalanced equation for the reaction of gold with aqua regia is given. Add the stoichiometric coefficients to the equation to balance it. equation: Au(s) + HNO, (aq) + HCl(aq) - HAUCI, (aq) + NO,2(g) + H,O(1)

The unbalanced equation for the reaction of gold with aqua regia is given. Add the stoichiometric coefficients to the equation to balance it. equation: Au(s) + HNO, (aq) + HCl(aq) - HAUCI, (aq) + NO,2(g) + H,O(1)

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter20: Environmental Chemistry-earth's Environment, Energy, And Sustainability

Section: Chapter Questions

Problem 41PS

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Concept explainers

States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.

Question

Gold has always been a highly prized metal, and it has been widely used from the beginning of history as a store of value. It
does not rust like iron and does not become tarnished like silver. It is so chemically inert that it will not react with even the
strongest concentrated acids. But it can be dissolved in aqua regia, a fresh-prepared mixture of concentrated HNO, and HCl in
a 1:3 ratio.
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 from the acid solution 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. Add the stoichiometric coefficients to the equation
to balance it.
equation:
Au(s) + HNO, (aq) + HCI(aq)
→ HAUCI,(aq) + NO,(g) + H,O(1)

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