MINEQL Questionnaire

Turn in all appropriate MINEQL input, assumptions and output. Make surethat each question is answered and that the final answer(s) is highlighted
on the MINEQL output.
Section 1: Acid/base/alkalinity
1. Use MINEQL to:
a) Generate a log C vs pH diagram for a 10-3 M phosphate (PO4) system
b) Determine the pH of the following solution at
equilibrium: Recipe: [Na2HPO4) = 10-3 M, [HCI] = 10-3
Note: Turn in a pc-pH diagram and output showing the pH of solution at
2. Find the pH of the following solution at equilibrium.
Recipe: [NH4Cl]1 = 10-3 [NaOH] = 10-3, P NH3 =
atm Species: H20, H*, OH, Na+, CI, NH4+, NH3(aq),
Reactions: NH4* = NH3(aq) + H+ pka = 9.2
NH3(g) = NH3(aq) PKH = -1.8
3. Calculate the alkalinity of a carbonate solution in equilibrium with the
atmosphere (Pco2 = 10-3.5) and a having a pH = 7.3. Assume only
carbonate system is important.
Section 2: Precipitation and dissolution problem
a) Generate a solubility diagram (p[Fe] dissolved vs. pH) from pH 0 to 14
for a system in equilibrium with solid goethite (FeOOH (s)) using
MINEQL. Show only dissolved Fe+3 species and Fe+3 total dissolved.
b) In the closed, model freshwater system described below, having Cat =
10-4 M and Ct = 10-2 M, at what pH, if any, will calcite (CaCO3)
precipitate? Ignore all other solids. Show appropriate MINEQL output to
support your answer.
pH = ?
TOTCa = 1 E-4
TOTK = 6.0E-5
TOTSO4 = 1.0E-4
TOT Na = 2.8E-4 M
TOTMg = 1.6E-4
TOTCI = 2.0E-4
TOTCO3= 1 E-2
c) At what [Ca*?] concentration, if any, would calcite precipitate in a
closed freshwater with the following composition? Ignore all other
solids. Show appropriate MINEQL output to support your answer.
Freshwater model:
pH = 8.1
TOTCa = ?
TOTK = 6.0E-5
TOTSO4 = 1.0E-4
TOT Na = 2.8E-4M
TOTMg = 1.6E-4
TOTCI = 2.0E-4
TOTCO3= 1 E-3
Section 3: Complexation chemistry problem
4. Using the models specified below, determine the total solubility of Cd(OH)2(s)
expressed as [Cd+2+ (aq)] in seawater and freshwater (total refers to the sum of
all dissolved Cd+2 forms). Ignore all other solids. Which type of water yields the
highest total dissolved concentration of cadmium (Cd+2+ (aq)]? Show appropriate
MINEQL output to support your answer.
Seawater model:
pH = 8.1
TOTCa = 1.02E-2
TOTK = 1.02E-2
TOTSO4 = 2.82E-2
TOTNa = 4.68E-1 M
TOTMg = 5.32E-2
TOTCI = 5.45E-1
TOTCO3= 2.38E-3
Freshwater model:
pH = 8.1
TOTCa = 1 E-4
TOTK = 6.0E-5
TOTSO4 = 1.0E-4
TOTNa = 2.8E-4 M
TOTMg = 1.6E-4
TOTCI = 2.0E-4
TOTCO3= 1 E-3
5. Using the seawater model specified in the previous problem, determine the
inorganic speciation of mercury (II) (i.e. calculate the % distribution of all
dissolved Hg+2 species). Assume no solids and a Hg+2 concentration of 1E-10 M.
6. A freshwater lake with the simple composition
Nat = Cat = Mgt = KT = Clt = [SO4]1 = [CO3]1 = 10-3 M
Contains an organic complexing agent X characterized by
HX = H+ + X- log Ka = -7.0
CuX+ = Cu 2+ + X log K = -10.0
CaX+ = Ca2+ + X- log K = -2.0
MgX+ = Mg2+ + X log K = -2.0
Calculate the dissolved copper speciation at pH 9 when Cut = 10-8 M, XT = 10-6
M. Do not consider solid phases or ionic strength effects.
Section 4. Redox
7. Assume the equilibrium pe in an aquatic system is controlled by the
concentrations of S042 and HS. Calculate the pe of the system, [Fe2, and
[Fe+ ] if [SO ] = 10 Mand [HS] = 10 M, pH = 8, and [Fer] is 2E-6. Ignore all
8. Determine which form of total dissolved iron (Fe+2, or Fe+3T) would dominate
if the pH = 8 and pe = 4.0 and Fet = 2E-6. Ignore all solids.
9. Assume a normal earth atmosphere (pO2 = 10-0.7 atm), pH =8, and that the
copper species are in equilibrium with the O2/H20 couple. What are the
predicted equilibrium concentrations of Cu+1 and Cut2 under these conditions for
a solution containing 10-4 M total copper? Ignore all solids.
10. Assume a normal earth atmosphere (pO2 = 10-0.7 atm), pH =8, and that the
aqueous sulfur species (SO42 and HS-) are in equilibrium with the Oz/H20
couple. Calculate the equilibrium concentrations of the three sulfur species under
these conditions for a solution containing 10-6 M total sulfur?

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