thermodynamics homework

thermodynamics homework - CE 3230 Thermodynamics Homework...

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CE 3230 Thermodynamics Homework Text problems: 2.6 ( 0.25 ), 2.12 ( 35 mg/L ), 2.16 ( 85,000 and 142,000 kg ). 1. Can you oxidize sulfide with nitrate via the following reaction at pH 8 if the concentration of all the reactants and products (except H + ) is 10 -4 M? What other factor would need to be considered? -- +2 32 4 4 H +NO HS H O SO NH + ++ + . 85 3 K1 0 = Yes, the rate of reaction (i.e., the time required) would also need to be considered 2. If the initial concentration of Mg 2+ is 30 mg/L, how much Mg 2+ can theoretically be removed by the precipitation of Mg(OH) 2 (s) via the following reaction if the pH is raised to 11 during water softening (removal of hardness, Mg 2+ and Ca 2+ )? Mg(OH) 2 (s) Mg 2+ + 2 OH - K so = 10 -10.7 98% 3. If log K SO , calcite (CaCO 3 (s)) = -8.61 at 50 ºC, would calcite be over- or under- saturated in a hot water heater at 50 ºC if the water was in equilibrium with calcite at 25 ºC (log K SO
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This note was uploaded on 04/28/2008 for the course CIVL 3230 taught by Professor Barnett during the Spring '08 term at Auburn University.

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