AP Chemistry 3.7: Solutions and Mixtures

Practice AP Chemistry 3.7 questions on calculating molarity, moles of solute, solution volume, dilution, and preparing solutions from stock solutions.

Exam points

Use electron configurations and periodic trends to predict reactivity, ion formation, and properties.
Interpret atomic-size, ionization-energy, and electron-affinity data to explain periodic behavior and bonding.

Covered syllabus points

3.7.A—Calculate the number of solute particles, volume, or molarity of solutions

[Maximum number: 1]

Answer the following questions about magnesium.

A student combines 35.00 mL of $1.85 \times 10^{-3} M \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}(a q)$ with 50.00 mL of

$2.80 \times 10^{-4} M \mathrm{NaOH}(a q)$ , as shown in the diagram. Calculate $\left[\mathrm{Mg}^{2+}\right]$ after the two solutions are

combined but before any reaction takes place. (Assume that volumes are additive.)

Beaker 3

D For the correct calculated value:

Point 06

$\begin{aligned} & M_{1} V_{1}=M_{2} V_{2} \\ & M_{2}=\frac{\left(1.85 \times 10^{-3} M\right)(0.03500 \mathrm{~L})}{(0.03500 \mathrm{~L}+0.05000 \mathrm{~L})}=7.62 \times 10^{-4} M \end{aligned}$

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Covered syllabus points

3.7 Solutions and Mixtures question 1