Solid Waste Engineering
3rd Edition
ISBN: 9781305888357
Author: Worrell
Publisher: Cengage
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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).
A drinking water treatment plant wants to compare the efficacy of three different solid coagulants, Alum [Al(OH)3(s)], Lime (CaCO3(s)), and Ferric Chloride (FeCl3(s)), for removing the phosphate (PO43-) level to 1 mg/L. The following are the equilibrium reactions [and the respective equilibrium constants (or solubility products, Ksp)] that result in phosphate removalfor each solid, the second reaction being more relevant in each case:
Alum: Al(OH)3(s) ↔ Al3+ + 3OH- AlPO4(s) ↔ Al3+ + PO43- Ksp = 9.84 x 10-21
Lime: CaCO3(s) ↔ Ca2+ + CO32-
Ca3(PO4)2(s) ↔ Ca2+ + PO43- Ksp = 1 x10-27
Ferric Chloride: FeCl3 (s) ↔ Fe3+ + 3Cl-
Fe(PO4)(s) ↔ Fe3+ + PO43- Ksp = 1x10-26.4
What concentrations of Fe 3+, Al3+, and Ca2+ will be needed to maintain a phosphate concentration of 1 mg/L? What would be the best choice of solid coagulant for the Drinking Water Treatment Plant?…
Chapter 6 Solutions
Solid Waste Engineering
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