5 Questions
What is the relationship between pH and pOH?
pH + pOH = 14
What is the pH of a solution if the pOH is 10?
4
How can you calculate the pH if you know the pOH?
pH = 14 - pOH
What is the pOH of a solution if the pH is 8?
6
Why is it easy to find either pH or pOH when the other is known?
Because pH and pOH have a simple addition relationship
Study Notes
pH and pOH Relationship
- pH + pOH = 14
- pH = 14 - pOH
- pOH = 14 - pH
pH and pOH Calculations
- pH = -log[H+]
- pOH = -log[OH-]
pH Scale
- Proposed by Soren Sorenson in 1909
- Neutral solutions have a pH of 7.0
- pH < 7.0 is strongly acidic
- pH > 7.0 is strongly basic
- pH of a neutral solution: pH = -log (1.0 x 10-7 mol/L) = 7.0
Examples of pH and pOH Calculations
- pH of a 0.0235 M HCl solution: pH = -log[H+] = -log(0.0235) = 1.629
- pOH of a 0.0235 M HCl solution: pOH = 14 - pH = 14 - 1.629 = 12.371
- pH of a 6.50 x 10-3 M KOH solution: pOH = -log[OH-] = -log(6.50 x 10-3) = 2.187, pH = 14 - pOH = 14 - 2.187 = 11.813
Autoionization of Water
- H2O(ℓ) + H2O(ℓ) → H3O+(aq) + OH-(aq)
- Occurs in every sample of water, whether pure or part of a solution
- About 6 in every 100 million (6 in 10^8) water molecules undergo autoionization
Homemade Indicator
- Made from plant materials containing anthocyanins (e.g. red cabbage, blueberries, blackberries, purple grape juice)
- Used to test for acids and bases
Test your knowledge of acid-base chemistry, including Brønsted-Lowry acid and base reactions, pH, and pOH calculations. Practice problems and questions to help you prepare for your exam.
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