Chapter 17.3, Problem 32SSC

Interpretation Introduction

Interpretation: An experiment needs to be written to show which one of the two given ions is soluble in aqueous solution.

Concept Introduction: When two ions are present in a solution, the one with lower K_sp will precipitate.

Answer to Problem 32SSC

The samples of magnesium and lead hydroxide can be taken and mixed in water. Since both the compounds have the same ion, one will act as a precipitating agent depending on the K_sp of both compounds. In the proposed experiment, lead hydroxide will precipitate out and magnesium will remain dissolved showing that ${\text{Mg}}^{2+}$ remains contained in the solution.

Explanation of Solution

The K_spof magnesium hydroxide is much greater than the K_sp of lead hydroxide which is why it remains contained in the solution.

Conclusion

With the above experiment, one can find out the ions that remain contained in the solution.