Assign oxidation numbers to each element in the following compounds. (e) KClO3

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Identify the oxidation number of potassium (K). Since K is an alkali metal, it typically has an oxidation number of +1.

Assign the oxidation number of oxygen (O). In most compounds, oxygen has an oxidation number of -2.

Let the oxidation number of chlorine (Cl) be x. Write the equation based on the sum of oxidation numbers in the compound KClO3, which must equal zero: +1 (for K) + x (for Cl) + 3(-2) (for O) = 0.

Simplify the equation: +1 + x - 6 = 0.

Solve for x to find the oxidation number of chlorine.

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Oxidation Numbers

Oxidation numbers are assigned to atoms in a compound to indicate the degree of oxidation or reduction. They help in understanding electron transfer during chemical reactions. The rules for assigning oxidation numbers include that the oxidation number of an element in its elemental form is zero, and for monoatomic ions, it equals the charge of the ion.

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02:42

Oxidation Numbers

Rules for Assigning Oxidation Numbers

There are specific rules for assigning oxidation numbers, such as oxygen typically having an oxidation number of -2, hydrogen being +1 when bonded to non-metals, and alkali metals (like potassium) always having an oxidation number of +1. In compounds, the sum of oxidation numbers must equal the overall charge of the molecule or ion.

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Oxidation Number Rules

KClO3 Structure

KClO3, or potassium chlorate, consists of potassium (K), chlorine (Cl), and three oxygen (O) atoms. Understanding the structure is crucial for assigning oxidation numbers, as the oxidation state of chlorine can vary depending on its bonding with oxygen. In KClO3, chlorine typically has an oxidation number of +5, balancing the -6 contribution from the three oxygen atoms.

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