1. Create in excel a logC–pH diagram for a system in equilibrium with ferric hydroxide (Fe(OH)3(s)). The Ksp for Fe(OH)3(s) is XXXXXXXXXXConsider all of the hydroxide complexes. What is the FeT at pH...

1. Create in excel a logC–pH diagram for a system in equilibrium with ferric hydroxide (Fe(OH)3(s)). The Ksp for Fe(OH)3(s) is 10-38.80. Consider all of the hydroxide complexes. What is the FeT at pH 3, 6 and 8. Identify the area of the diagram where the solid will precipitate. 2. Determine the total molar concentration of dissolved Zn (ZnT) in equilibrium with ZnCO3(s) in a system with 10-2 M ClT and 5.0 x 10-3 M CO3,T, at pH 8.0. (Assume that the solubility constant for the solid ZnCO3 is 10-10.26. Also assume that the concentrations of the ligands do not change significantly by complexation. Look at Tables 9.3 and 9.4 for the species to consider.) 3. Determine the speciation of manganese when 2.0 ×10−6 M Mn(NO3) 2 added to water at pH 6 and at pH 9. Assume that the manganese does not participate in any redox reactions but remains wholly as MnII. Solve manually using the thermodynamic data in Table 9.3.


Microsoft Word - PS 7-2019.doc CVEN/EVEN 4404 Water Chemistry Problem Set 7 1. Create in excel a logC–pH diagram for a system in equilibrium with ferric hydroxide (Fe(OH)3(s)). The Ksp for Fe(OH)3(s) is 10-38.80. Consider all of the hydroxide complexes. What is the FeT at pH 3, 6 and 8. Identify the area of the diagram where the solid will precipitate. 2. Determine the total molar concentration of dissolved Zn (ZnT) in equilibrium with ZnCO3(s) in a system with 10-2 M ClT and 5.0 x 10-3 M CO3,T, at pH 8.0. (Assume that the solubility constant for the solid ZnCO3 is 10-10.26. Also assume that the concentrations of the ligands do not change significantly by complexation. Look at Tables 9.3 and 9.4 for the species to consider.) 3. Determine the speciation of manganese when 2.0 ×10−6 M Mn(NO3)2 added to water at pH 6 and at pH 9. Assume that the manganese does not participate in any redox reactions but remains wholly as MnII. Solve manually using the thermodynamic data in Table 9.3.