CourseCourseConceptConceptDocsDocuments

AP Chemistry 7.11 Introduction to Solubility Equilibria Questions

Practice AP Chemistry Unit 7.11 questions on writing Ksp expressions and calculating molar solubility, ion concentrations, or dissolved mass.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Use electrochemical models and reduction potentials to predict redox direction, cell voltage, and electrodes.
  • Calculate or interpret electron transfer, charge balance, stoichiometry, and thermodynamic favorability from data.

Covered syllabus points

7.11.A—Calculate the solubility of a salt based on the value of Ksp for the salt

Question 1

[Maximum number: 2]

Strontium hydroxide dissolves in water according to the following equation. The KspK_{s p} expression for strontium hydroxide is provided.

Sr(OH)2(s)⇄Sr2+(aq)+2OH−(aq)Ksp=[Sr2+][OH−]2\mathrm{Sr}(\mathrm{OH})_{2}(s) \rightleftarrows \mathrm{Sr}^{2+}(a q)+2 \mathrm{OH}^{-}(a q) \quad K_{s p}=\left[\mathrm{Sr}^{2+}\right]\left[\mathrm{OH}^{-}\right]^{2}
Figure for Question 1 — AP Chemistry
Figure for Question 1 — AP Chemistry

Question (a)

(a)

The student prepares a saturated solution by adding excess Sr(OH)2(s)\mathrm{Sr}(\mathrm{OH})_{2}(s) to distilled water and stirring until no more solid dissolves. The student then determines that [Sr2+]=0.043M\left[\mathrm{Sr}^{2+}\right]=0.043 M in the solution.

[ 2 ]

Question (i)

(i)

Calculate the value of [OH−]\left[\mathrm{OH}^{-}\right]in the solution.

[ 1 ]

Question (ii)

(ii)

Calculate the value of KspK_{s p} for Sr(OH)2\mathrm{Sr}(\mathrm{OH})_{2}.

[ 1 ]
All question bank results loaded