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Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter4: Types Of Chemical Reactions And Solution Stoichiometry
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Problem 106AE: Many over-the-counter antacid tablets are now formulated using calcium carbonate as die active...
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3. Arsenic trioxide, As:0s, is an odorless white powder that has relatively high solubility in water. It is also an extremely toxic poison, and causes symptoms similar to cholera. Until the invention of the Marsh test in mid-1830s, detecting the presence of arsenic trioxide in the body was nearly impossible. In the Marsh test, a sample suspected of containing arsenic trioxide is treated with zinc metal and a strong acid. The zinc spontaneously reduces the arsenic in As,0, to As", which in the acidic solution becomes protonated to form arsine (AsH1) gas. The detection of arsine gas indicates a positive test for arsenic trioxide. The Marsh test is capable of detecting as little as 10 ug of arsenic trioxide. Zn(s) + As,0, (aq) → AsH, (g) + Zn" (ag) a. How many zinc atoms must be oxidized to detect 10 ug of As,0,? b. How many total electrons are transferred in part (a)? c. How many times does the reaction occur in part (a)?
Transcribed Image Text:3. Arsenic trioxide, As:0s, is an odorless white powder that has relatively high solubility in water. It is also an extremely toxic poison, and causes symptoms similar to cholera. Until the invention of the Marsh test in mid-1830s, detecting the presence of arsenic trioxide in the body was nearly impossible. In the Marsh test, a sample suspected of containing arsenic trioxide is treated with zinc metal and a strong acid. The zinc spontaneously reduces the arsenic in As,0, to As", which in the acidic solution becomes protonated to form arsine (AsH1) gas. The detection of arsine gas indicates a positive test for arsenic trioxide. The Marsh test is capable of detecting as little as 10 ug of arsenic trioxide. Zn(s) + As,0, (aq) → AsH, (g) + Zn" (ag) a. How many zinc atoms must be oxidized to detect 10 ug of As,0,? b. How many total electrons are transferred in part (a)? c. How many times does the reaction occur in part (a)?
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