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Questions and Answers
What is the relationship between pH and pOH?
What is the relationship between pH and pOH?
What is the pH of a solution if the pOH is 10?
What is the pH of a solution if the pOH is 10?
How can you calculate the pH if you know the pOH?
How can you calculate the pH if you know the pOH?
What is the pOH of a solution if the pH is 8?
What is the pOH of a solution if the pH is 8?
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Why is it easy to find either pH or pOH when the other is known?
Why is it easy to find either pH or pOH when the other is known?
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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
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Description
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.
