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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 19.1, Problem 1RC
Textbook Problem
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Copper(II) sulfide reacts with nitric acid according to the balanced equation:

3 CuS(s) + 8 H+(aq) + 2 NO3(aq) → 3 Cu2+(aq) + 3 S(s) + 4 H2O(ℓ) + 2 NO(g) The substance oxidized is

  1. (a) CuS
  2. (b) H+
  3. (c) NO3

Interpretation Introduction

Interpretation: The substance that oxidized in the given reactions is to be determined from the given option.

Concept introduction:

  • The substance that easily be reduced in a reaction is represented as an oxidizing agent. The substance that easily be oxidized in a reaction is represented as an reducing agent.
  • Redox reaction: In a reaction both oxidation and reduction occurs at the same time.

Steps followed to balance a redox (reduction-oxidation) reaction occurs in acidic medium,

  • Redox reacions can be sperated into two half-reactions, such as oxidation reaction and reduction reaction.
  • Balancing of oxygen and hydrogen are carried out by adding water and H+ ions in the half-reactions, and balance the number of elctrons then make the number of electrons in oxidation and reduction reactions equal by multiplying by integers.
  • Club the both half-reactions

Explanation of Solution

Reason for correct option

CuS reacts with nitric acid giving Cu2+ and S . The oxidation state of Cu is 2+ which remains same after the reaction whereas the oxidation state of S increases from 2to0 . It indicates that S loses two electrons and hence CuS gets oxidized.

The substance that oxidized in the given reactions is CuS

Hence the correct option for the substance that oxidized in the given reactions is option a.

Reasons for incorrect options:

Write all the given substances in the options except option a

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Chapter 19 Solutions

Chemistry & Chemical Reactivity
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Ch. 19.3 - Which of the following statements is correct for...Ch. 19.3 - 2. You can determine if an automobile lead-based...Ch. 19.4 - (a) Rank the following metals in their ability to...Ch. 19.4 - The net reaction that occurs in a voltaic cell is...Ch. 19.4 - 2. Which metal in the following list is easiest to...Ch. 19.4 - Determine which of the following redox equations...Ch. 19.4 - A lithium ion battery produces a voltage of 3.6 V....Ch. 19.4 - Use the energy produced by the combustion of...Ch. 19.4 - What mass of lithium ion batteries would produce...Ch. 19.5 - A voltaic cell is set up with an aluminum...Ch. 19.5 - Check Your Understanding The half-cells Fe2+(aq,...Ch. 19.5 - 1. Calculate Ecell at 298 K for a cell involving...Ch. 19.6 - The following reaction has an E value of 0.76 V:...Ch. 19.6 - Calculate the equilibrium constant at 25 C for the...Ch. 19.6 - 1. 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