AP Chemistry 3.10 A Explain the Relationship Between the Solubility of Ionic and Molecular Compounds in Aqueous and Nonaqueous Questions

Explore AP Chemistry 3.10.A questions on predicting solubility from matching intermolecular interactions, polarity, hydrogen bonding, and ionic interactions.

Exam points

Explain how equilibrium constants and reaction quotients describe composition in reversible chemical systems.
Apply equilibrium expressions and concentration changes to predict reaction shifts toward products or reactants.

[Maximum number: 2]

Answer the following questions about the compounds $\mathrm{NH}_{2} \mathrm{Cl}$ and $\mathrm{NCl}_{3}$ . The Lewis electron-dot diagrams of the two compounds are shown.

Figure for Question AP Chemistry 3.10 A Explain the Relationship Between the Solubility of Ionic and Molecular Compounds in Aqueous and Nonaqueous Questions question 1 — AP Chemistry

$\mathrm{NH}_{2} \mathrm{Cl}$ is highly soluble in water, whereas $\mathrm{NCl}_{3}$ is nearly insoluble. Explain this observation in terms of the types and relative strengths of the intermolecular forces between each of the solutes and water.

For the correct identification of intermolecular forces between each substance and water: 1 point Accept one of the following:

- Both $\mathrm{NH}_{2} \mathrm{Cl}$ and $\mathrm{NCl}_{3}$ can participate in hydrogen bonding with water.

- Both $\mathrm{NH}_{2} \mathrm{Cl}$ and $\mathrm{NCl}_{3}$ have dipole-dipole attractions to water.

For a correct explanation: 1 point The intermolecular forces between $\mathrm{NH}_{2} \mathrm{Cl}$ molecules and water are stronger than those between $\mathrm{NCl}_{3}$ molecules and water, which leads to the greater solubility of $\mathrm{NH}_{2} \mathrm{Cl}$ in water.

Total for part (b) 2 points

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AP Chemistry 3.10 A Explain the Relationship Between the Solubility of Ionic and Molecular Compounds in Aqueous and Nonaqueous Questions question 1