AP Chemistry 3.8: Representations of Solutions

Practice AP Chemistry 3.8 questions on drawing particulate solution models that show relative concentrations, charge balance, dissociation, and interactions.

Exam points

Use periodic trends and electron configurations to compare element properties, ion formation, and reactivity.
Interpret atomic and ionic size, electronegativity, and ionization-energy data to explain bonding and behavior.

Covered syllabus points

3.8.A—Using particulate models for mixtures: i. Represent interactions between components. ii. Represent…

[Maximum number: 1]

A student is studying the properties of $\mathrm{CaSO}_{4}$ and $\mathrm{PbSO}_{4}$ . The student has samples of both compounds, which are white powders.

Draw a particulate representation of $\mathrm{PbSO}_{4}(s)$ and the ions dissolved in the solution in the beaker on the right in the diagram. Draw the particles to look like those shown to the right of the beaker. Draw an appropriate number of dissolved ions relative to the number of dissolved ions in the beaker on the left.

For a correct drawing that shows an equal number of cations and anions: 1 point
The drawing shows solid $\mathrm{PbSO}_{4}$ at the bottom of the beaker (similar to the solid shown for $\mathrm{CaSO}_{4}$ ) and fewer dissociated $\mathrm{Pb}^{2+}$ and $\mathrm{SO}_{4}{ }^{2-}$ ions in the solution.

Higher Conductivity Solution

Lower Conductivity Solution

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Covered syllabus points

3.8 Representations of Solutions question 1