Ch.4 - Reactions in Aqueous Solution

Brown - Chemistry: The Central Science 14th Edition

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Brown 14th Edition

Ch.4 - Reactions in Aqueous Solution

Problema 26c

Capitolo 4, Problema 26c

Write balanced net ionic equations for the reactions that occur in each of the following cases. Identify the spectator ion or ions in each reaction. (c) Na₂S(aq) + CoSO₄(aq) →

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Identify the ions present in the reactants: Na^+, S^2-, Co^2+, and SO_4^2-.

Determine the possible products by exchanging the ions: Na_2SO_4 and CoS.

Write the molecular equation: Na_2S(aq) + CoSO_4(aq) → Na_2SO_4(aq) + CoS(s).

Identify the precipitate formed: CoS is insoluble and will precipitate out of the solution.

Write the net ionic equation by removing the spectator ions (Na^+ and SO_4^2-): S^2-(aq) + Co^2+(aq) → CoS(s).

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Net Ionic Equations

Net ionic equations represent the actual chemical species that participate in a reaction, excluding spectator ions. To write a net ionic equation, one must first write the balanced molecular equation, then dissociate all soluble ionic compounds into their constituent ions, and finally eliminate the spectator ions that do not change during the reaction.

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00:51

Net Ionic Equations

Spectator Ions

Spectator ions are ions that exist in the same form on both the reactant and product sides of a chemical equation. They do not participate in the actual chemical reaction and can be removed from the net ionic equation. Identifying spectator ions is crucial for simplifying the equation to focus on the species that undergo a change.

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06:17

Ion Formation

Solubility Rules

Solubility rules are guidelines that help predict whether an ionic compound will dissolve in water. These rules indicate which ions are generally soluble or insoluble in aqueous solutions. Understanding solubility is essential for determining the state of reactants and products in a reaction, which is necessary for writing balanced net ionic equations.

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Solubility Rules

Pratica correlata

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Which ions remain in solution, unreacted, after each of the following pairs of solutions is mixed? (c) ammonium phosphate and calcium chloride

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Domanda del libro di testo

Separate samples of a solution of an unknown ionic compound are treated with dilute AgNO3, Pb1NO322, and BaCl2. Precipitates form in all three cases. Which of the following could be the anion of the unknown salt: Br-, CO32-, NO3-?

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Domanda del libro di testo

Write balanced net ionic equations for the reactions that occur in each of the following cases. Identify the spectator ion or ions in each reaction.

(a) Ba(OH)₂(aq) + FeCl₃(aq) →

(b) ZnCl₂(aq) + Cs₂CO₃(aq) →

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Domanda del libro di testo

You know that an unlabeled bottle contains an aqueous solution of one of the following: AgNO3, CaCl2, or Al21SO423. A friend suggests that you test a portion of the solution with Ba1NO322 and then with NaCl solutions. According to your friend's logic, which of these chemical reactions could occur, thus helping you identify the solution in the bottle? (a) Barium sulfate could precipitate. (b) Silver chloride could precipitate. (c) Silver sulfate could precipitate. (d) More than one, but not all, of the reactions described in answers a–c could occur. (e) All three reactions described in answers a–c could occur.

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