Predict whether a precipitation reaction will occur when aqueous solutions of the following substances are mixed. For those that form a precipitate, write the net ionic reaction. (d)

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Identify the ions present in each of the aqueous solutions. For example, if the solutions are of NaCl and AgNO3, the ions would be Na^+, Cl^-, Ag^+, and NO3^-.

Determine the possible combinations of cations and anions that can form new compounds. In our example, the possible combinations are NaNO3 and AgCl.

Use the solubility rules to determine if any of the new combinations form an insoluble compound (precipitate). According to solubility rules, AgCl is insoluble in water.

If a precipitate forms, write the balanced molecular equation for the reaction. For example, AgNO3(aq) + NaCl(aq) -> AgCl(s) + NaNO3(aq).

Write the net ionic equation by removing the spectator ions (ions that do not participate in the formation of the precipitate) from the balanced molecular equation. For the example, the net ionic equation is Ag^+(aq) + Cl^-(aq) -> AgCl(s).

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주요 개념

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Precipitation Reactions

Precipitation reactions occur when two aqueous solutions are mixed, resulting in the formation of an insoluble solid, known as a precipitate. This happens when the product of the reaction has a solubility product (Ksp) that is exceeded in the solution, leading to the aggregation of ions into a solid form. Understanding the solubility rules helps predict whether a precipitate will form.

Solubility Rules

Solubility rules are guidelines that help predict the solubility of various ionic compounds in water. These rules indicate which compounds are generally soluble or insoluble in aqueous solutions, based on the ions present. For example, most nitrates are soluble, while many carbonates are not. Familiarity with these rules is essential for determining the outcome of mixing different ionic solutions.

Net Ionic Equations

Net ionic equations represent the actual chemical species involved in a precipitation reaction, excluding spectator ions that do not participate in the reaction. To write a net ionic equation, one must first identify the ions in solution, determine which form a precipitate, and then write the equation showing only the ions and compounds that undergo a change. This simplifies the reaction and highlights the key components involved.