Specify what ions are present in solution upon dissolving each of the following substances in water: a. FeCl2

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Identify the compound: FeCl2 is iron(II) chloride.

Determine the ions formed: When FeCl2 dissolves in water, it dissociates into its constituent ions.

Write the dissociation equation: FeCl2 (s) → Fe^{2+} (aq) + 2 Cl^{-} (aq).

Recognize the ions in solution: The ions present in the solution are Fe^{2+} and Cl^{-}.

Note the stoichiometry: For each formula unit of FeCl2, one Fe^{2+} ion and two Cl^{-} ions are produced.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Dissociation of Ionic Compounds

When ionic compounds like FeCl2 dissolve in water, they dissociate into their constituent ions. This process occurs because the polar water molecules surround and separate the individual ions, allowing them to disperse throughout the solution.

Ionic Composition of FeCl2

FeCl2 is composed of iron (Fe) and chloride (Cl) ions. Specifically, it contains one iron ion with a +2 charge (Fe²⁺) and two chloride ions, each with a -1 charge (Cl⁻). Understanding this composition is crucial for identifying the ions present in solution.

Electrolytes in Solution

Electrolytes are substances that dissociate into ions in solution and can conduct electricity. The presence of Fe²⁺ and Cl⁻ ions from the dissociation of FeCl2 makes the solution an electrolyte, which is important for various chemical and biological processes.

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