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Ch.18 - Aqueous Ionic Equilibrium
Chapter 18, Problem 101

A solution containing sodium fluoride is mixed with one containing calcium nitrate to form a solution that is 0.015 M in NaF and 0.010 M in Ca(NO3)2. Does a precipitate form in the mixed solution? If so, identify the precipitate.

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Key Concepts

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

Solubility Product Constant (Ksp)

The solubility product constant (Ksp) is a numerical value that represents the extent to which a compound can dissolve in water. It is specific to each ionic compound and is determined at a given temperature. When the product of the concentrations of the ions in a solution exceeds the Ksp, a precipitate will form, indicating that the solution is supersaturated.
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Ionic Equilibrium

Ionic equilibrium refers to the balance between the dissolved ions in a solution and the solid phase of a compound. In the context of precipitation reactions, it is essential to understand how the concentrations of ions change when two solutions are mixed, and how these changes can lead to the formation of a solid precipitate if the ionic product exceeds the Ksp.
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Common Ion Effect

The common ion effect describes the decrease in solubility of an ionic compound when a common ion is added to the solution. In this scenario, the presence of fluoride ions from sodium fluoride can affect the solubility of calcium fluoride (CaF2) if it forms, leading to a potential precipitate. Understanding this effect is crucial for predicting whether a precipitate will form when mixing solutions.
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