Q1. For each of the following, write molecular and net ionic equations for any precipitation reaction that occurs. If no reaction occurs, indicate this. a. Zinc chloride and sodium sulfide are dissolved in water.

Background

Topic: Precipitation Reactions and Net Ionic Equations

This question tests your understanding of how to predict precipitation reactions, write balanced molecular equations, and derive the net ionic equation. You will need to use solubility rules to determine if a precipitate forms when two aqueous solutions are mixed.

Key Terms and Formulas

• Precipitation Reaction: A reaction where an insoluble solid (precipitate) forms when two solutions are mixed.

• Molecular Equation: Shows all reactants and products as compounds with their physical states.

• Net Ionic Equation: Shows only the ions and molecules directly involved in the reaction (removes spectator ions).

• Solubility Rules: Used to determine if a compound is soluble (aq) or insoluble (s) in water.

Step-by-Step Guidance

1. Write the formulas for the reactants: zinc chloride () and sodium sulfide (), both dissolved in water (aqueous).

2. Predict the products by exchanging the cations and anions: pairs with and pairs with .

3. Write the unbalanced molecular equation for the reaction, including physical states (use solubility rules to determine if each product is soluble or forms a precipitate).

4. Balance the molecular equation.

5. Identify and remove spectator ions to write the net ionic equation. Use the solubility rules to confirm which compound is the precipitate.

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