PH practice - Mrs. Klatt's Science Page
pH practice problems
1. What is the pH of a 1.2 x 10-3 M HBr solution?
2. What is the pH of a 2.34 x 10-5 M NaOH solution?
3. What is the pH of a solution made by adding water to 15 grams of hydroiodic acid until the volume of the solution is 2500 mL?
4. What is the pH and pOH of a solution that was made by adding 400 mL of water to 350 mL of 5.0 x 10-3 M NaOH solution?
5. Calculate the pH of a 0.0033 M H2SO4 solution (remember: sulfuric acid is diprotic).
6. Calculate the [H3O+] of the following solutions:
a. pH = 3.0
b. pH = 4.70
c. pOH = 6.200
7. A swimming pool has a volume of one million liters. How many grams of HCl would need to be added to that swimming pool to bring the pH down from 7 to 4? (Assume the volume of the HCl is negligible)
pH practice - Answers
1. What is the pH of a 1.2 x 10-3 HBr solution?
pH: 2.9
2. What is the pH of a 2.34 x 10-5 NaOH solution?
pH: 9.4
3. What is the pH of a solution made by adding water to 15 grams of hydroiodic acid until the volume of the solution is 2500 mL?
pH: 1.6
4. What is the pH and pOH of a solution that was made by adding 400 mL of water to 350 mL of 5.0 x 10-3 M NaOH solution?
pOH: 2.7 pH: 11.3
5. Calculate the pH of a 0.0033 M H2SO4 solution (remember: sulfuric acid is diprotic).
pH =2.18
6. Calculate the [H3O+] of the following solutions:
a) 0.001 M
b) 2.0 x10-5 M
c) 5.6 x10-14 M
7. A swimming pool has a volume of one million liters. How many grams of HCl would need to be added to that swimming pool to bring the pH down from 7 to 4? (Assume the volume of the HCl is negligible)
3545 grams (100. moles)
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