Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 6, Problem 6.9P
Estimate the production of CO2 and CH4 during the anaerobic decomposition of ethanol. C2H6O.
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NaOH (aq) + HCI (aq) NACI (aq) + H2O (1)
Volume of 1.00M HCI (mL)
45.0
Volume of 1.00 M NAOH (mL)
50.0
Initial Temperature ("C)
22.1
Final Temperature (C)
31.6
la) Calculate the moles of HCI used in the reaction.
Moles of HCI =
mol
(b) Calculate the moles of NaOH used in the reaction.
Moles NaOH=
mol
(c) Which reactant is the Limiting Reactant, HCl or NaOH?
Limiting Reactant =
(d) Is this acid-base neutralization reaction exothermic or endothermic?
NOTE: DO Include the correct number of significant figures or you will be marked
wrong and DO NOT include units in your answer.
You are being consulted for the design of a coagulation-flocculation basin for a water treatment plant. Ferric sulfate is available as a commercial coagulant and is popular at removing turbidity and color. The chemical reaction for its addition to water is: Fe2(SO4)3 + 3Ca(HCO3)2 ----> 2Fe(OH)3 (s) + 3CaSO4 + 6CO2Results of a jar test to determine the optimal coagulant dose are provided below. The initial water sample has a pH=6.5 and turbidity of 30 NTU. Ferric sulfate dose, mg/L: 5 10 15 20 25Turbudity, NTU: 15 5 1 0.9 2What is the optimal mass of ferric sulfate you would need to purchase every day to treat 106 gallons/day to a turbidity below 1 NTU (assume 100% purity of the coagulant).
In wastewater treatment plants, ammonium ion is removed from the water by raising the pH to form ammonia in an air stripping process described on p 65, in the textbook. This is the equilibrium reaction that describes the process of ammonium conversion to ammonia:
NH4+ ⇄ NH3,aq + H+
Ammonia in the water then readily converts to ammonia gas,
a) Plot a graph showing the concentration of ammonium ion as a function of pH. Use an Excel spreadsheet.b) If the wastewater pH is raised to 10, what fraction of ammonium ion did not react to form ammonia?
Chapter 6 Solutions
Solid Waste Engineering
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