Textbook Question
Determine the oxidation number for the indicated element in each of the following substances: f. Cr in BaCrO4.
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Ch.4 - Reactions in Aqueous Solution
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement111
- Ch.2 - Atoms, Molecules, and Ions166
- Ch.3 - Chemical Reactions and Reaction Stoichiometry138
- Ch.4 - Reactions in Aqueous Solution127
- Ch.5 - Thermochemistry104
- Ch.6 - Electronic Structure of Atoms109
- Ch.7 - Periodic Properties of the Elements107
- Ch.8 - Basic Concepts of Chemical Bonding102
- Ch.9 - Molecular Geometry and Bonding Theories120
- Ch.10 - Gases122
- Ch.11 - Liquids and Intermolecular Forces79
- Ch.12 - Solids and Modern Materials102
- Ch.13 - Properties of Solutions99
- Ch.14 - Chemical Kinetics153
- Ch.15 - Chemical Equilibrium83
- Ch.16 - Acid-Base Equilibria109
- Ch.17 - Additional Aspects of Aqueous Equilibria117
- Ch.18 - Chemistry of the Environment60
- Ch.19 - Chemical Thermodynamics109
- Ch.20 - Electrochemistry113
- Ch.21 - Nuclear Chemistry79
- Ch.22 - Chemistry of the Nonmetals52
- Ch.23 - Transition Metals and Coordination Chemistry57
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry7
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 4, Problem 50e
Determine the oxidation number for the indicated element in each of the following substances: e. Cl in HClO2
Verified step by step guidance1
Identify the oxidation number of hydrogen (H), which is typically +1.
Identify the oxidation number of oxygen (O), which is typically -2.
Let the oxidation number of chlorine (Cl) be x.
Set up the equation based on the sum of oxidation numbers in the compound HClO2, which must equal zero: 1 (for H) + x (for Cl) + 2(-2) (for O) = 0.
Solve the equation for x to find the oxidation number of Cl.
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Oxidation Number
The oxidation number, or oxidation state, is a theoretical charge assigned to an atom in a compound, reflecting its degree of oxidation or reduction. It helps in understanding electron transfer in redox reactions. Oxidation numbers can be positive, negative, or zero, and they follow specific rules, such as the oxidation number of oxygen is usually -2, and hydrogen is +1.
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02:42
Oxidation Numbers
Rules for Assigning Oxidation Numbers
There are several rules for assigning oxidation numbers, including that the sum of oxidation numbers in a neutral compound must equal zero. For polyatomic ions, the sum must equal the ion's charge. Additionally, elements in their elemental form have an oxidation number of zero, while alkali metals are always +1 in compounds, and alkaline earth metals are +2.
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Structure of HClO2
HClO2, known as chlorous acid, contains chlorine (Cl) bonded to two oxygen atoms and one hydrogen atom. Understanding the molecular structure is crucial for determining the oxidation state of chlorine. In this compound, the presence of oxygen, which typically has a -2 oxidation state, influences the oxidation number of chlorine, requiring careful calculation based on the overall charge balance.
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Related Practice
Textbook Question
Determine the oxidation number for the indicated element in each of the following substances: a. S in SO2
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Which element is oxidized, and which is reduced in the following reactions? (a) N2(g) + 3 H2(g) → 2 NH3(g)
458
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Determine the oxidation number for the indicated element in each of the following substances: d. Br in HBrO
2
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Textbook Question
Which element is oxidized, and which is reduced in the following reactions? (c) Cl2(aq) + 2 NaI(aq) → I2(aq) + 2 NaCl(aq) (d) PbS(s) + 4 H2O2(aq) → PbSO4(s) + 4 H2O(l)
718
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Textbook Question
Determine the oxidation number for the indicated element in each of the following substances: c. Mn in KMnO4,
2
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