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Ch.4 - Chemical Quantities & Aqueous Reactions
Chapter 4, Problem 77a

Write a molecular equation for the precipitation reaction that occurs (if any) when each pair of aqueous solutions is mixed. If no reaction occurs, write 'NO REACTION.' a. potassium carbonate and lead(II) nitrate

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Key Concepts

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

Precipitation Reactions

Precipitation reactions occur when two aqueous solutions react to form an insoluble solid, known as a precipitate. This process is driven by the formation of a compound that is not soluble in water, leading to its separation from the solution. Identifying potential precipitates involves consulting solubility rules, which dictate the solubility of various ionic compounds in water.
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Molecular Equations

A molecular equation represents the reactants and products of a chemical reaction in their molecular form, showing all species involved. In the context of precipitation reactions, it illustrates the reactants that are mixed and the resulting products, including any precipitate formed. Balancing the equation is essential to reflect the conservation of mass and charge.
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Solubility Rules

Solubility rules are guidelines that help predict whether a compound will dissolve in water or form a precipitate. These rules categorize ionic compounds based on their solubility, indicating which ions are generally soluble or insoluble in aqueous solutions. Understanding these rules is crucial for determining the outcome of mixing different ionic solutions, such as potassium carbonate and lead(II) nitrate.
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