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AP Chemistry
3.8 Representations of Solutions
3.7 Solutions and Mixtures
IntermediateMCQDrawing RepresentationsProportional AnalysisConceptual22.8k
A single square diagram container representing a fixed sample volume of an aqueous solution. At the top, a legend defines two symbols: a filled black circle represents \(\text{Mg}^{2+}\) and an open white circle with a solid black outline represents \(\text{Cl}^-\). Inside the square boundary, exactly 3 filled black circles and exactly 6 open white circles are dispersed throughout the area. One filled circle is positioned in the upper-left quadrant, one in the center, and one in the lower-right quadrant. The six open circles are distributed uniformly in the surrounding spaces between the filled circles, with none touching each other or the container walls. Solvent water molecules are omitted for clarity. No other particles, lines, labels, text, or annotations appear.
Particulate representation of a \(10.0 \text{ mL}\) sample of \(0.60 \text{ M } \text{MgCl}_2\text{(aq)}\).
A student prepares a \(0.60 \text{ M}\) aqueous solution of magnesium chloride, \(\text{MgCl}_2\text{(aq)}\). The particulate model shown represents a \(10.0 \text{ mL}\) sample of this solution. The student then dilutes the entire \(10.0 \text{ mL}\) sample by adding distilled water until the total volume reaches \(30.0 \text{ mL}\). Which of the following correctly identifies the number of \(\text{Mg}^{2+}\) and \(\text{Cl}^-\) ions that should be drawn in an identical box to represent a \(10.0 \text{ mL}\) sample of the diluted solution, and provides the correct justification?

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