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Selenic acid (H2SEO4) is a powerful oxidizing acid that dissolves not only silver (as does the related acid H2SO4) but gold, through the following reaction:

Selenic acid (H2SEO4) is a powerful oxidizing acid that dissolves not only silver (as does the related acid H2SO4) but gold, through the following reaction:

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter4: Chemical Reactions
Section: Chapter Questions
Problem 4.130QP: Arsenic acid, H3AsO4, is a poisonous acid that has been used in the treatment of wood to prevent...
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5. Selenic acid (H2SEO4) is a powerful oxidizing acid that dissolves not only silver (as does the related acid H2SO4) but gold, through the following reaction: 2 Au (s) + 6 H2SEO4 (aq) → Au2(SeO4)3 (aq) + 3 H2SEO3 (aq) + 3 H2O (I) Determine the oxidation numbers of the atoms in this equation. Which species is oxidized and which is reduced? Hint: the selenate (SeO42-) and selenite (SeO3²-) polyatomic ions present in the above reaction are analogous to the sulfate and sulfite ions.
Transcribed Image Text:5. Selenic acid (H2SEO4) is a powerful oxidizing acid that dissolves not only silver (as does the related acid H2SO4) but gold, through the following reaction: 2 Au (s) + 6 H2SEO4 (aq) → Au2(SeO4)3 (aq) + 3 H2SEO3 (aq) + 3 H2O (I) Determine the oxidation numbers of the atoms in this equation. Which species is oxidized and which is reduced? Hint: the selenate (SeO42-) and selenite (SeO3²-) polyatomic ions present in the above reaction are analogous to the sulfate and sulfite ions.
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