AP Chemistry 3.8.A: Representations of Solutions

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

Exam points

Explain how chemical equilibrium responds to concentration, pressure and temperature changes in dynamic systems.
Apply Le Chatelier reasoning and equilibrium expressions to predict reaction shifts and compositions.

[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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3.8.A—Using particulate models for mixtures: i. Represent interactions between components. ii. Represent… question 1