CIE471/671 and CEN 461/661
Review Problems for the Final Exam
Problem 1
The wastewater from an industrial process behaves like a 10-2.75M HCN solution. HCN is a
monoprotic acid with pKa = 9.3.
a) find the pH of the wastewater.
b) what is the pH of the was

CIE 471/671 and CEN 461/661
Homework 2
Assigned: September 16, 2013
Due: September 23, 2013
Show all you calculations and transformations!
Problem 1 (10 pts.)
Growth by oxidation of hydrocarbons coupled to sulfate reduction can occur in anaerobic
environm

CIE 471/671 and CEN 461/661
Homework 5
Assigned: October 30, 2013
Due: November 6, 2013
Show all you calculations and transformations!
Problem 1 (25 pts./35pts.)
A 1L distilled water sample is allowed to equilibrate with the atmosphere.
a) (5 pts.) The gl

CIE 471/671 and CEN 461/661
Answers Homework 3
Problem 1 (15 pts.)
The acid dissociation reaction of interest is:
HOCl = H+ + OClTo find the molar concentration of HOCl:
0.005 L x 10 g/L 52.4522 g/mol = 0.00095 mol/L = 10-3.02 M
(1) KW = [H+] [OH-]
(2) Ka

CIE 471/671 and CEN 461/661
Answers Homework 5
Show all you calculations and transformations!
Problem 1 (20 pts./30pts.)
A distilled water sample is allowed to equilibrate with the atmosphere.
a) (4 pts.)
First, we need to find the partial pressure of CO2

CIE 471/671 and CEN 461/661
Answers Homework 4
Show all you calculations and transformations!
Problem 1 (20 pts.)
(6 pts.) For a system with 5 x10-3 M NaHCO3 and 10-3 M NH3(aq) the proton condition is:
+1 proton
H2CO3
NH4+
H+
Species added -1 proton
CO32H

CIE 471/671 and CEN 461/661
Homework 6
Assigned: November 13, 2013
Due: November 20, 2013
Show all you calculations and transformations!
Problem 1 (35 pts.)
An industrial wastewater has a pH of 6.1 and DIC = 10-3.5M.
a) (10pts.) Find the total alkalinity

CIE 471/671 and CEN 461/661
Homework 4
Assigned: October 9, 2013
Due: October 16, 2013
Show all you calculations and transformations!
Problem 1 (10 pts.)
What is the pH of a solution containing 5 x10-3 M NaHCO3 and 10-3 NH3(aq)?
Problem 2 (20 pts.)
Determ

CIE471/671 and CEN 461/661
Review Problems for the Midterm Exam
Problem 1
The wastewater from an industrial process behaves like a 10-2.75M HCN solution. HCN is a
monoprotic acid with pKa = 9.3.
a) find the pH of the wastewater.
b) what is the pH of the w

CIE 471/671 and CEN 461/661
Homework 1
Assigned: August 26, 2013
Due: September 4, 2013
Show all you calculations and transformations to receive full credit!
Problem 1 (10 pts.)
a) Calculate how much SnCl2 (in grams) needs to be dissolved in 3L reagent wa

CIE 471/671 and CEN 461/661
Homework 3
Assigned: October 2, 2013
Due: October 9, 2013
Show all you calculations and transformations!
Problem 1 (15 pts.)
Hidrochlorous acid (HOCl) is commonly used as a disinfectant. If 5mL of 10 g/L solution of
HOCl is dil