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The presence of arsenic in a sample that may also contain another Group 5A element, antimony, can be confirmed by first precipitating the As 3+ and Sb 3+ ions as yellow solid As 2 S 3 and orange solid Sb 2 S 3 . If aqueous HCI is then added, only Sb 2 S 3 dissolves, leaving behind solid As 2 S 3 . The As 2 S 3 can then be dissolved using aqueous HNO 3 . 3 As 2 S 3 (s) + 10 HNO 3 (aq) + 4 H 2 O( ℓ ) → 6 H 3 AsO 4 (aq) + 10 NO(g) + 9 S(s) Finally, the presence of arsenic is confirmed by adding AgNO 3 to the solution of H 3 AsO 4 to precipitate a reddish brown solid Ag x AsO y The composition of this solid is As, 16.199% and Ag, 69.964%. (a) What are the oxidation numbers of As, S, and N in the reaction of As 2 S 3 with nitric acid? (b) What is the formula of the reddish brown solid Ag x AsO y ?

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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074
BuyFind

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074

Solutions

Chapter
Section
Chapter 3, Problem 101SCQ
Textbook Problem

The presence of arsenic in a sample that may also contain another Group 5A element, antimony, can be confirmed by first precipitating the As3+ and Sb3+ ions as yellow solid As2S3 and orange solid Sb2S3. If aqueous HCI is then added, only Sb2S3 dissolves, leaving behind solid As2S3. The As2S3 can then be dissolved using aqueous HNO3.

3 As2S3(s) + 10 HNO3(aq) + 4 H2O() → 6 H3AsO4(aq) + 10 NO(g) + 9 S(s)

Finally, the presence of arsenic is confirmed by adding AgNO3 to the solution of H3AsO4 to precipitate a reddish brown solid AgxAsOy The composition of this solid is As, 16.199% and Ag, 69.964%.

(a) What are the oxidation numbers of As, S, and N in the reaction of As2S3 with nitric acid?

(b) What is the formula of the reddish brown solid AgxAsOy?

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Chapter 3 Solutions

Chemistry & Chemical Reactivity
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