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Chemistry 19.2
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Ion Product Constant for Water
19.2 Ion Product Constant for Water For aqueous solutions, the product of the hydrogen-ion concentration and the hydroxide-ion concentration equals 1.0 Any aqueous solution in which [H+] and [OH-] are equal is described as a neutral solution.
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Ion Product Constant for Water
19.2 Ion Product Constant for Water The product of the concentrations of the hydrogen ions and hydroxide ions in water is called the ion-product constant for water (Kw).
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Ion Product Constant for Water
19.2 Ion Product Constant for Water An acidic solution is one in which [H+] is greater than [OH-].
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Ion Product Constant for Water
19.2 Ion Product Constant for Water A basic solution is one in which [H+] is less than [OH]. Basic solutions are also known as alkaline solutions.
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19.1
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Solve Problem 10 with the help of an interactive guided tutorial.
for Sample Problem 19.1 Problem Solving 19.10 Solve Problem 10 with the help of an interactive guided tutorial.
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19.2 The pH Concept The pH of a solution is the negative logarithm of the hydrogen-ion concentration.
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19.2 The pH Concept Calculating pH
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The pH of pure water or a neutral aqueous solution is 7.0.
19.2 The pH Concept A solution in which [H+] is greater than 1 10–7 M has a pH less than 7.0 and is acidic. The pH of pure water or a neutral aqueous solution is 7.0. A solution with a pH greater than 7 is basic and has a [H+] of less than 1 10–7 M.
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19.2 The pH Concept
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19.2 The pH Concept Calculating pOH
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pH and Significant Figures
19.2 The pH Concept pH and Significant Figures The pH scale shows the relationship between pH and the hydrogen-ion concentration. Interpreting Diagrams What happens to [H+] as pH increases?
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19.2
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Solve Problem 12 with the help of an interactive guided tutorial.
for Sample Problem 19.2 Problem Solving 19.12 Solve Problem 12 with the help of an interactive guided tutorial.
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Solve Problem 14 with the help of an interactive guided tutorial.
for Sample Problem 19.3 Problem Solving 19.14 Solve Problem 14 with the help of an interactive guided tutorial.
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Phenolphthalein changes from colorless to pink at pH 7–9.
19.2 Measuring pH Phenolphthalein changes from colorless to pink at pH 7–9. Acid-base indicators respond to pH changes over a specific range. Phenolphthalein changes from colorless to pink at pH 7–9.
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Solve Problem 15 with the help of an interactive guided tutorial.
for Sample Problem 19.4 Problem Solving 19.15 Solve Problem 15 with the help of an interactive guided tutorial.
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19.2 Measuring pH Acid-Base Indicators
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19.2 Measuring pH Indicators change color at a different pH. INTERPRETING GRAPHS a. Identify Which indicator changes color in a solution with a pH of 2? b. Compare and Contrast What do you notice about the range over which each indicator changes color? c. Apply Concepts Which indicator would you choose to show that a solution has changed from pH 3 to pH 5?
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Universal Indicators 19.2 Measuring pH
You can find acidic and basic substances in your home. a) Universal indicator solution has been added to solutions of known pH in the range from 1 to 12 to produce a set of reference colors. b) Universal indicator has been added to samples of vinegar, soda water, and ammonia solution. Interpreting Photographs Use the reference colors to assign pH values to vinegar, soda water, and ammonia solution.
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19.2 Measuring pH pH Meters A pH meter provides a quick and accurate way to measure the pH of a solution. a) Water is neutral, having a pH of 7. b) The pH of vinegar, a dilute aqueous solution of ethanoic (acetic) acid, is about 3. c) The pH of milk of magnesia, an aqueous suspension of magnesium hydroxide, is Applying Concepts What are some advantages of using a pH meter rather than an indicator?
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19.2 Section Quiz. 19.2.
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19.2 Section Quiz. 1. If the [OH-] in a solution is 7.65 10-3M, what is the [H+] of this solution? 7.65 10-17M 1.31 10-12M 2.12M 11.88M
![19.2 Section Quiz. 1. If the [OH-] in a solution is 7.65 10-3M, what is the [H+] of this solution](http://slideplayer.com./slide/12271893/72/images/38/19.2+Section+Quiz.+1.+If+the+%5BOH-%5D+in+a+solution+is+7.65+%EF%82%B4+10-3M%2C+what+is+the+%5BH%2B%5D+of+this+solution.jpg "7.65 10-17M 10-12M. 2.12M M.")
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19.2 Section Quiz. 2. The [OH-] for four solutions is given below. Which one of the solution is basic? 1.0 x 10-6M 1.0 x 10-8M 1.0 x 10-7M 1.0 x 10-14M
![19.2 Section Quiz. 2. The [OH-] for four solutions is given below. Which one of the solution is basic](http://slideplayer.com./slide/12271893/72/images/39/19.2+Section+Quiz.+2.+The+%5BOH-%5D+for+four+solutions+is+given+below.+Which+one+of+the+solution+is+basic.jpg "1.0 x 10-6M. 1.0 x 10-8M. 1.0 x 10-7M. 1.0 x 10-14M.")
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19.2 Section Quiz. 3. What is the pH of a solution with a hydrogen- ion concentration of 8.5 x 10-2M? 12.93 8.50 5.50 1.07
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