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AP Chemistry 2.3.A: Structure of Ionic Solids

Explore AP Chemistry 2.3.A questions on representing ionic crystals as ordered arrays of cations and anions that maximize attraction and minimize repulsion.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Explain how acid-base reactions involve proton transfer and conjugate acid-base pairs in solution.
  • Apply pH, pOH and equilibrium relationships to calculate concentrations in aqueous acid-base systems.

2.3.A—Represent an ionic solid with a particulate model that is consistent with Coulomb’s law and the properties of… question 1

[Maximum number: 1]

A student investigates the enthalpy of solution, ΔHsoln \Delta H_{\text {soln }}, for two alkali metal halides, LiCl and NaCl. In addition to the salts, the student has access to a calorimeter, a balance with a precision of ±0.1 g, and a thermometer with a precision of ±0.1°C.

Below is a representation of a portion of a crystal of LiCl. Identify the ions in the representation by writing the appropriate formulas ( Li+\mathrm{Li}^{+}or Cl−\mathrm{Cl}^{-}) in the boxes below.

Figure for Question 2.3.A—Represent an ionic solid with a particulate model that is consistent with Coulomb’s law and the properties of… question 1 — AP Chemistry
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