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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) Na2S and FeCl3.

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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 soluble salts are mixed, resulting in the formation of an insoluble compound, or precipitate. This process is driven by the low solubility of the product in the solution, leading to its separation from the liquid phase. Understanding the solubility rules helps predict whether a precipitate will form when specific ionic compounds are combined.
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Solubility Rules

Solubility rules are guidelines that help predict the solubility of various ionic compounds in water. For example, most sulfides (like Na2S) are insoluble except for those of alkali metals and ammonium. Knowing these rules allows chemists to determine which combinations of ions will result in a precipitate when mixed in solution.
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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, meaning that matter is neither created nor destroyed in the reaction. Writing a balanced equation for a precipitation reaction involves identifying the reactants, the products formed, and ensuring that the number of atoms for each element is the same on both sides.
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