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Ch.4 - Reactions in Aqueous Solution
Chapter 4, Problem 23c

Will precipitation occur when the following solutions are mixed? If so, write a balanced chemical equation for the reaction. c. FeSO4 and Pb(NO3)2

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Determine the possible products of the reaction by swapping the anions and cations of the reactants: FeSO4 and Pb(NO3)2 can form Fe(NO3)2 and PbSO4.
Consult the solubility rules to determine if any of the products are insoluble in water. PbSO4 is generally insoluble, while Fe(NO3)2 is soluble.
Since PbSO4 is insoluble, it will precipitate out of the solution, indicating that a precipitation reaction occurs.
Write the balanced chemical equation for the reaction: FeSO4(aq) + Pb(NO3)2(aq) -> Fe(NO3)2(aq) + PbSO4(s).
Verify that the equation is balanced by ensuring the same number of each type of atom appears on both sides of the equation.

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Key Concepts

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

Solubility Rules

Solubility rules are guidelines that help predict whether a compound will dissolve in water. For example, most sulfates are soluble, but barium sulfate and lead(II) sulfate are exceptions. Understanding these rules is crucial for determining if a precipitation reaction will occur when two solutions are mixed.
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Precipitation Reactions

A precipitation reaction occurs when two soluble salts react in solution to form an insoluble product, known as a precipitate. This process can be represented by a balanced chemical equation, which shows the reactants and the products formed. Identifying the precipitate is essential for answering the question about whether precipitation will occur.
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Balanced Chemical Equations

A balanced chemical equation represents a chemical reaction with equal numbers of each type of atom on both sides of the equation. Balancing ensures the law of conservation of mass is upheld. In the context of precipitation reactions, writing a balanced equation helps illustrate the reactants and the precipitate formed, providing clarity on the reaction process.
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