1. What is the activity coefficient for phosphate ion (PO43-), γPO43-, in a solution with ionic strength μ = 0.070 M? Calculate using the extended Debye-Huckel equation.
a) 0.126 b) 0.799 c) 0.465 d) 0.505 or e) 1.00
2. For a 0.150 M solution of sodium sulfide, Na2S, the mass balance for the sulfide is ______ (choose the appropriate). A tip: Anion S2- is the conjugate base of a diprotic acid, H2S, which may react with water as a base.
3. Using activities of the ions, calculate the molar solubility of AgCl in an aqueous solution containing an inertelectrolyte with ionic strength μ=0.05. Ksp(AgCl)= 1.8Ã10-10.
4. Which of the following species must have the activity coefficient γ = 1 (and hence, the activity = concentration),regardless of the ionic strength of the solution?
(a) HF; (b) F-; (c) H3O+; (d) Na+; (e) Al3+; (f) NH3; (g) H2O; (h) OH-.
5. Which of the following ionic salts will not increase the solubility in acidic aqueous solution relative to its solubility in pure water?
(a) NaF; (b) LiCl; (c) Ca(ClO4)2; (d) NH4CH3COO; (e) KNO2; (f) Cu(NO3)2
1. What is the activity coefficient for phosphate ion (PO43-), γPO43-, in a solution with ionic strength μ = 0.070 M? Calculate using the extended Debye-Huckel equation.
a) 0.126 b) 0.799 c) 0.465 d) 0.505 or e) 1.00
2. For a 0.150 M solution of sodium sulfide, Na2S, the mass balance for the sulfide is ______ (choose the appropriate). A tip: Anion S2- is the conjugate base of a diprotic acid, H2S, which may react with water as a base.
3. Using activities of the ions, calculate the molar solubility of AgCl in an aqueous solution containing an inertelectrolyte with ionic strength μ=0.05. Ksp(AgCl)= 1.8Ã10-10.
4. Which of the following species must have the activity coefficient γ = 1 (and hence, the activity = concentration),regardless of the ionic strength of the solution?
(a) HF; (b) F-; (c) H3O+; (d) Na+; (e) Al3+; (f) NH3; (g) H2O; (h) OH-.
5. Which of the following ionic salts will not increase the solubility in acidic aqueous solution relative to its solubility in pure water?
(a) NaF; (b) LiCl; (c) Ca(ClO4)2; (d) NH4CH3COO; (e) KNO2; (f) Cu(NO3)2
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