Applied Hydrogeology - Fetter - 4t Edition - Chapter 9 - Solutions

9.1 How much KCl is in one liter of a 0.26-molar solution?
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9.2 How much NaCl is in one liter of a 0.75-molar solution?
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9.3 The solubility product for CuCl is 10−5.9. What is the solubility of Cu+ at equilibrium with CuCl?
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9.4 The solubility product of CaSO4 is 10−4.5. What is the solubility of Ca2+ at equilibrium with CaSO4?
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9.5 The solubility product of fluorite, CaF2, is 10−10.5.
(A) What is the solubility or Ca2+ at equilibrium with fluorite?
(B) If CaF2 is dissolved in a solution of 0.009-molar F−, how much will dissolve at equilibrium?

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9.6 The solubility product of MgF2 is 10−8.2
(A) What is the solubility of Mg2+ at equilibrium with MgF2?
(B) If MgF2 is dissolved in a solution of 0.011-molar F−, how much will dissolve at equilibrium?

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9.7 Given the following ground-water analysis at 25°C:...
(A) Convert all analyses into molal concentrations.
(B) Compute ionic strength.
(C) Compute activity coefficient for each ion.
(D) Find activity of each ion.
(E) Convert analyses to meq/L.
(F) Do a cation-anion balance..
(G) Find the Kiap of anhydrite (CaSO4).
(H) Compare the Kiap of anhydrite with the Ksp of anhydrite (10−4.5).
(I) Find the Kiap of calcite (CaCO3).
(J) Compare the Kiap of calcite with the Ksp of calcite (10−8.4).

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9.8 Given the following ground-water analysis at 25°C:...
(A) Convert all analyses into molal concentrations.
(B) Compute ionic strength.
(C) Compute the activity coefficient for each ion.
(D) Find the activity of each ion.
(E) Convert analyses to meq/L.
(F) Do a cation-anion balance.
(G) Find the Kiap of anhydrite (CaSO4).
(H) Compare the Kiap of anhydrite with the Ksp of anhydrite (10−4.5).
(I) Find the Kiap of calcite (CaCO3).
(J) Compare the Kiap of calcite with the Ksp of calcite (10−8.4).

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9.9 What are [H+] and [OH−] for an aqueous solution at pH 9.32?
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9.10 What are [H+] and [OH−] for an aqueous solution at pH 3.21?
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9.11 What is the pH of a 0.0041-molal solution of H2CO3?
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9.12 What is the pH of a 0.0075-molal solution of H2CO3?
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9.13 What is the pH of a 0.0041-molal solution of HCl?
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9.14 Given the following analysis of ground water:......
(A) Convert all values to meq/L.
(B) Do an anion-cation balance.
(C) Plot the position on a trilinear diagram (Figure 9.17).
(D) Make a Stiff pattern of the analysis.
(E) Make a Schoeller diagram of the analysis.

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9.15 The solubility product at 25°C for barite (BaSO4) is 10−9.97 and the ΔH0r is 26.6 kJ/mol. R is 8.3143 J/mol-K. What is the solubility product of barite in a hot springs with a temperature of 43°C?
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9.16 The solubility product at 25°C for magnesite (MgCO3) is 10−8.03 and the ΔH0r is −25.81 kJ/mol. R is 8.3143 J/mol K. What is the solubility product of magnesite in water at a temperature of 12°C?
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