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 ?
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 ?
Solution Summary: The author explains how the oxidation number of As, S and N in the reaction with Nitric acid should be determined.
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.
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?
2. Platinum and other group 10 metals often act as solid phase hydrogenation catalysts for
unsaturated hydrocarbons such as propylene, CH3CHCH2. In order for the reaction to be
catalyzed the propylene molecules must first adsorb onto the surface. In order to completely
cover the surface of a piece of platinum that has an area of 1.50 cm² with propylene, a total
of 3.45 x 10¹7 molecules are needed. Determine the mass of the propylene molecules that
have been absorbed onto the platinum surface.
Chem 141, Dr. Haefner
2. (a) Many main group oxides form acidic solutions when added to water. For example solid
tetraphosphorous decaoxide reacts with water to produce phosphoric acid. Write a balanced
chemical equation for this reaction.
(b) Calcium phosphate reacts with silicon dioxide and carbon graphite at elevated temperatures
to produce white phosphorous (P4) as a gas along with calcium silicate (Silcate ion is SiO3²-)
and carbon monoxide. Write a balanced chemical equation for this reaction.
Problem Set 4a Chem 1411. A latex balloon is filled with a total of carbon dioxide gas so that its volume reaches 1.352 L. The balloon whose weight was originally 0.753 g, now weighs 2.538 g. How many molecules of carbon dioxide have been added to the balloon?
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell