pH Calculations 
1. What is the pH of a 0.0010 M HCl solution?

a)  0.0       b)  1.0         c)  2.0         d)  3.0         e)   4.0
2. What is the molar concnetration in a solution of pH 5.50?

a)   5.50 M     b)   3.2 X 10-5 M      c)   5.0 X 10-5 M    
d)   3.2 X 10-6 M      e)    3.2 X 10-1 M
3. What hydrogen ion concentration corresponds to a pH of 8.64?

a)    0.94 M      b)   4.4 X 10-6 M      c)   2.3 X 10-6 M    
d)   4.4 X 10-9 M      e)    2.3 X 10-9 M
4. What is the hydrogen ion concentration in a solution of pH 5.76?

a)  1.74 X 10-6 M       b)   5.76 X 10-6 M      c)   2.40 X 10-6 M   
d)   5.76 X 10-5 M      e)   7.64 X 10-5 M
5.  What is the  [H+] in a 0.15 molar solution of acetic acid in water at 25oC?  Acetic acid is 1.3% dissociated.

a)  1.10 X 10-2 M       b)   1.95 X 10-3 M      c)   1.20 X 10-4 M   
d)   1.80 X 10-5 M      e)   2.75 X 10-6 M
6.  What is the H+ ion concentrtaion of an aqueous solution that has a pH of 11?

a)  1.0 X 10-11 M       b)   1.00 X 10-3 M      c)   3.0 X 10-1 M    d)   11 X 10-1 M
7. If an aqueous solution has a [OH-1] = 3.0 X 10-11, the solution would be

a) an acidic solution    b) a basic solution   c) a neutral solution   d) a salty solution
8. The pH of a solution in which the hydroxide ion concentration is 2.00 X 10-3 mol/L is

a) 1.70        b)  2.70        c)  11.0       d) 11.3
9. The pH of a solution is 5.  The hydrogen ion and hydroxide ion concentrations are:

a)   [H+1] = 1.0 X 10-9 M;  [OH-1] = 1.0 X 10-5 M
b)   [H+1] = 1.0 X 10-5 M;  [OH-1] = 1.0 X 10-5 M
c)   [H+1] = 1.0 X 10-5 M;  [OH-1] = 1.0 X 10-9 M
d)   [H+1] = 1.0 X 10-7 M;  [OH-1] = 1.0 X 10-9 M
10.  The pOH of 0.00010 M nitric acid solution is

a)   1.0 X 10-10     b)   1.0 X 10-4      c)   10          d)   4.0 
11. How are acidic, basic, and neutral solutions in water defined;

a)  in terms of [H+1] and [OH-1]

b)  in terms of pH
12. A sodium hydroxide solution is prepared by dissolving 6.0 g of NaOH in 1.00 L of water.  What is the pOH and pH of this solution?
13. A solution was made by dissolving 0.837 grams of Ba(OH)2 in 100 mL of water.  If Ba(OH)2 is fully dissociated into ions what is the pOH and pH of the resulting solution?
14. What is the pH and pOH of a solution made by adding 400 mL of distilled water to 10 mL of 0.010 M HNO3?  You may assume that volumes are additive.
15.   What is the [OH-1] and pH of these solutions:

a)    5.6 mg of KOH dissolved in 100 mL of solution.

b)    74 mg of Ca(OH)2 dissoved in 2.0 litres of solution.
            Answers