Chapter 17: Problem 45
Write balanced equations and solubility product expressions for the solubility equilibria of the following compounds: (a) \(\mathrm{CuBr}\), (b) \(\mathrm{ZnC}_{2} \mathrm{O}_{4},(\mathrm{c}) \mathrm{Ag}_{2} \mathrm{CrO}_{4},\) (d) \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}\), (e) \(\mathrm{AuCl}_{3}\) (f) \(\mathrm{Mn}_{3}\left(\mathrm{PO}_{4}\right)_{2}\).
Short Answer
Step by step solution
Understand Solubility Product
Write the Equilibrium Equation for CuBr
Write the Equilibrium Equation for ZnC2O4
Write the Equilibrium Equation for Ag2CrO4
Write the Equilibrium Equation for Hg2Cl2
Write the Equilibrium Equation for AuCl3
Write the Equilibrium Equation for Mn3(PO4)2
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Solubility Product (K_sp)
The solubility product is calculated as the product of the concentrations of the ions, each raised to the power of their stoichiometric coefficients from the balanced equilibrium equation. For example, if you have a compound \( AB \) that dissolves into \( A^+ \) and \( B^- \), the solubility product expression is \( K_{sp} = [A^+][B^-] \).
- \( K_{sp} \) helps determine whether a precipitate will form in a solution.
- A small \( K_{sp} \) value indicates low solubility and therefore, a higher likelihood of precipitation.
Ionic Dissociation
Consider \( \text{CuBr} \): when it dissolves, it separates into \( \text{Cu}^+ \) and \( \text{Br}^- \), demonstrating ionic dissociation. The equilibrium equation is:
\[ \text{CuBr (s)} \rightleftharpoons \text{Cu}^{+} \text{(aq)} + \text{Br}^{-} \text{(aq)} \] This is crucial because it shows the formation of ions that affect the rates and extents of chemical reactions.
- Dissociation strength affects the solubility of the compound.
- Proper representation of dissociation is essential for calculating \( K_{sp} \).
Equilibrium Equations
For example, consider the dissolution of \( \text{Ag}_2\text{CrO}_4 \): it dissociates into \( 2\text{Ag}^+ \) and \( \text{CrO}_4^{2-} \): \[ \text{Ag}_2\text{CrO}_4 (s) \rightleftharpoons 2\text{Ag}^{+} \text{(aq)} + \text{CrO}_4^{2-} \text{(aq)} \] This illustrates the balance of dissolution and precipitation at equilibrium.
- The coefficients from the balanced chemical equation become exponents in the \( K_{sp} \) expression.
- Understanding equilibrium helps in predicting the concentration of ions in a saturated solution.
Sparingly Soluble Compounds
Some examples include \( \text{ZnC}_2\text{O}_4 \) and \( \text{Mn}_3(\text{PO}_4)_2 \). Upon dissolution, they establish an equilibrium between the solid phase and its ionic components in the solution.
- They usually have very low \( K_{sp} \) values.
- In practice, these compounds slightly affect the ionic concentration in solutions, making them relevant in precipitation reactions.