Problem 16
What chemical reaction takes place when solid sodium sulfide is dissolved in water? Write the chemical equation.
Problem 22
What is a formation constant and what is an instability constant?
Problem 24
For \(\mathrm{PbCl}_{3}^{-}, K_{\text {form }}=2.5 \times 10^{1}\). If a solution containing this complex ion is diluted with water, \(\mathrm{PbCl}_{2}\) precipitates. Write the equations for the equilibria involved and use them together with Le Châtelier's principle to explain how this happens.
Problem 25
Write the \(K_{\mathrm{sp}}\) expressions for each of the following compounds: (a) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2},\) (b) \(\mathrm{AgBr}\), (c) \(\mathrm{PbBr}_{2}\), (d) \(\mathrm{CuCl}\), (e) \(\mathrm{HgI}_{2}\)
Problem 26
Write the \(K_{\mathrm{sp}}\) expressions for each of the following com- pounds: (a) \(\mathrm{AgI},(\mathbf{b}) \mathrm{CuI},(\mathbf{c}) \mathrm{AuCl}_{3},(\mathbf{d}) \mathrm{Hg}_{2} \mathrm{I}_{2},(\mathrm{e}) \mathrm{PbI}_{2}\).
Problem 27
Write the \(K_{\mathrm{sp}}\) expressions for each of the following com- pounds: (a) \(\mathrm{CaF}_{2},\) (b) \(\mathrm{Ag}_{2} \mathrm{CO}_{3},\) (c) \(\mathrm{PbSO}_{4},\) (d) \(\mathrm{Fe}(\mathrm{OH})_{3}\), (e) \(\mathrm{PbF}_{2}\), (f) \(\mathrm{Cu}(\mathrm{OH})_{2}\)
Problem 28
Write the \(K_{\mathrm{sp}}\) expressions for each of the following compounds: (a) \(\mathrm{Fe}_{3}\left(\mathrm{PO}_{4}\right)_{2},\) (b) \(\mathrm{Ag}_{3} \mathrm{PO}_{4}\), (c) \(\mathrm{PbCrO}_{4}\) (d) \(\mathrm{Al}(\mathrm{OH})_{3}\), (e) \(\mathrm{ZnCO}_{3}\) (f) \(\mathrm{Zn}(\mathrm{OH})_{2}\)
Problem 33
In water, the solubility of lead(II) chloride is \(0.016 M\). Use this information to calculate the value of \(K_{\mathrm{sp}}\) for \(\mathrm{PbCl}_{2}\).
Problem 35
Barium sulfate is so insoluble that it can be swallowed without significant danger even though \(\mathrm{Ba}^{2+}\) is toxic. At \(25{ }^{\circ} \mathrm{C}, 1.00 \mathrm{~L}\) of water dissolves only \(0.00245 \mathrm{~g}\) of \(\mathrm{BaSO}_{4} .\) Calculate the molar solubility and \(K_{\mathrm{sp}}\) for \(\mathrm{BaSO}_{4}\).
Problem 38
A student prepared a saturated solution of \(\mathrm{CaCrO}_{4}\) and found that when \(156 \mathrm{~mL}\) of the solution was evaporated, \(0.649 \mathrm{~g}\) of \(\mathrm{CaCrO}_{4}\) was left behind. What is the value of \(K_{\mathrm{sp}}\) for this salt?
