Dr. Herrick's CH223
Pressure Quiz 2

     

 
   

15 pH Exam Questions
 Copyright  D. Herrick
 

Remember:  H+ is shorthand for the hydronium ion, H3O+.
Practice for speed.  Aim for 30 seconds per problem.
(all concentrations in Molarity units)

  

  
1. [H+] in 0.125 M HCl is
A) 2.75 B) 1.00  C) 0.125 D) 0.250 E) zero

  

2. A solution that has [H3O+] = 4.77 × 10-3 M has pH =
A) 2.32 B) 3.01  C) 7.41 D) 4.28 E) 5.29

  

3. pH in 0.00015 M HNO3 is
A) 4.15 B) 10.48  C) 7.00 D) 3.82 E) 4.78

 

4. [OH-] in 0.39 M HCl is
A)    0.39
B) 2.56 × 10-14
C) 13.61
D)    4.7 × 10-4
E) 1.00 × 10-7

              

5. pOH in 0.66 M HNO3 is
A) 4.66 B) 6.43  C) 12.80 D) 8.14 E) 13.82

                    

6. pH in 12.5 M HCl is
A) -1.10 B) -2.50  C) 0.00 D) 2.50 E) 1.10

     

7. pH in 0.50 M KOH is
A) 2.00 B) 13.70  C) 12.00 D) 1.00 E) 13.00

     

8. [OH-] in 0.50 M NaOH is
A) 1.00 B)  0.71  C) 0.50 D) 4.22 E) 12.63

       

9. [H+] in a solution that has pH = 5.69 is
A)    3.19 × 10-6
B) 1.69 × 10-5
C) 5.69
D)    2.04 × 10-6
E) 4.90 × 10-4

 

         

10. [OH-] in a solution that has pH = 4.12 is
A) 4.12
B) 4.22 × 10-4
C) 9.88
D) 1.32 × 10-10
E) 1.70 × 10-8

     

11. At pH = 8.50 the ratio [H3O+]/[OH-] is
A) 0.001
B) 5.0 × 10-9
C) 6.3
D) 1.84 × 10+4
E) 1.50

     

12. If an acid has pKa = 2.34 then Ka is
A)    1.80 × 10-5
B) 5.0 × 10-6
C) 2.34
D)    8.24 × 10-10
E) 4.57 × 10-3

     

13. The pH of a solution of ascorbic acid is expected to be
A) greater than seven
B) equal to seven
C) less than seven

14. If a 1.0 M solution of an unknown compound has a pH of 9.5, the unknown substance is most likely
A) an acid
B) a base
C) insoluble in water
D) neutral water

     

15. As pKa increases the strength of the acid
A) increases
B) decreases
C) doesn't change

        

 

    

   


  

 

   Copyright  D. Herrick