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Acid-Base Equilibria-Module 4

Course Name:  Chemistry
Course No.132 NT
Teacher:  Bill Cook
Teacher's Email:  bcook@icc.edu









No. of Questions=  5























    
    
        


        








    1. 

What is the pH in a titration when 20.0 mL
        of 0.0150 M KOH has been added to 35.0 mL 0f 0.0100 M HCl? (Note that the resulting salt
        is neutral)
        
    
        



    

    















    

    
    
        a)
        
    2.26
        
    




    

    
    
        b)
        
    2.20
        
    




    

    
    
        c)
        
    2.85
        
    




    

    
    
        d)
        
    3.04
        
    




    

    
    
        e)
        
    2.00
        
    




    
    

    
    







    
    
        


        










    
    
        


        








    2. 

Which of the following statements is true of the
        titration of a weak monoprotic acid by a strong base such as sodium hydroxide?
        
    
        



    

    















    

    
    
        a)
        
    At the equivalence point, the pH is 7.
        
    




    

    
    
        b)
        
    The moles of acid are greater than the moles of base at the equivalence point.
        
    




    

    
    
        c)
        
    The moles of base are greater than the moles of acid at the equivalence point.
        
    




    

    
    
        d)
        
    The moles of acid equal the moles of base at the equivalence point.
        
    




    

    
    
        e)
        
    The solution is acidic at the equivalence point.
        
    




    
    

    
    







    
    
        


        









    3. 

A solution which is formed by combining 600 mL of
        0.10 M HNO3 with 400 mL of 0.20 M NaOH has a H3O+1
        concentration of:
        
    
        



    

    















    

    
    
        a)
        
    0.20
        
    




    

    
    
        b)
        
    0.10
        
    




    

    
    
        c)
        
    0.060
        
    




    

    
    
        d)
        
    0.020
        
    




    

    
    
        e)
        
    5.0 x 10-13
        
    




    
    

    
    







    
    
        


        








    4. 

What is the pH in a titration when 30.0 mL of
        0.0150 M KOH has been added to 35.0 mL 0f 0.0100 M HCl?  (note that the resulting
        salt is neutral)
        
    
        



    

    















    

    
    
        a)
        
    2.81
        
    




    

    
    
        b)
        
    13.0
        
    




    

    
    
        c)
        
    11.19
        
    




    

    
    
        d)
        
    1.0
        
    




    

    
    
        e)
        
    2.27
        
    




    
    

    
    







    
    
        


        









    5. 

What is the pH of a solution which is 0.0100 M in
        HA and also 0.0020 M in NaA    (Ka = 9.0 x 10-6)?
        
    
        



    

    















    

    
    
        a)
        
    2.40
        
    




    

    
    
        b)
        
    4.35
        
    




    

    
    
        c)
        
    5.65
        
    




    

    
    
        d)
        
    6.65
        
    




    

    
    
        e)
        
    7.15
        
    




    
    

    
    







    
    
        


        



















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