A sample of an arsenic compound weighing 0.1023 g was dissolved and all the arsenic converted to...
Question:
A sample of an arsenic compound weighing 0.1023 g was dissolved and all the arsenic converted to arsenic in the +3 oxidation state. A 0.0250 M solution of an acidified permanganate ({eq}MnO_4^- {/eq}), was added, which oxidized the arsenic to the +5 oxidation state. The manganese was reduced to the +2 state. If it took 10.64 mL of the permanganate solution to exactly react with the arsenic, what is the percentage of arsenic in the sample?
a) 42.5
b) 47.8
c) 7.79
d) 19.5
e) 48.7
Redox Reactions
When a chemical species changes its oxidation state due to the gain or loss of electrons, it undergoes a redox reaction. In determining the amount of a reactant or product using a redox reaction, we use the stoichiometric ratio from the balanced chemical equation.
Answer and Explanation: 1
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View this answerThe correct answer is e) 48.7.
Consider the redox reaction between arsenic and permanganate: {eq}\rm 5As^{3+} + 2MnO_4^- + 16H^+ \to 5As^{5+} +...
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Redox (Oxidation-Reduction) Reactions: Definitions and Examples
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Chapter 2 / Lesson 12
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What is a redox reaction (oxidation reduction reaction)? Learn about redox reaction examples, balancing redox reactions, and the redox reaction definition.
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