A 20.0-mL sample of 0.115 M sulfurous acid (H2SO3) solution is titrated with 0.1014 M KOH. At what added volume of base solution does each equivalence point occur?
Ch.17 - Aqueous Ionic Equilibrium
Chapter 17, Problem 83
Referring to Table 17.1, pick an indicator for use in the titration of each acid with a strong base. a. HF
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Titration
Acid-base titration is a quantitative analytical method used to determine the concentration of an acid or base in a solution. It involves the gradual addition of a titrant (strong base) to a solution of analyte (weak acid) until the reaction reaches the equivalence point, where the amount of acid equals the amount of base. The endpoint is often indicated by a color change, which is facilitated by an appropriate pH indicator.
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pH Indicators
pH indicators are substances that change color in response to changes in pH, allowing for the visual determination of acidity or alkalinity in a solution. Each indicator has a specific pH range over which it changes color, making it suitable for different types of titrations. Selecting the right indicator is crucial for accurately identifying the endpoint of a titration, especially when titrating weak acids with strong bases.
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Weak Acids vs. Strong Bases
Weak acids, like hydrofluoric acid (HF), do not completely dissociate in solution, resulting in a higher pH at the equivalence point compared to strong acids. When titrating a weak acid with a strong base, the pH at the equivalence point will be greater than 7, necessitating the use of a pH indicator that changes color in this range. Understanding the behavior of weak acids in titrations is essential for selecting the appropriate indicator from the provided table.
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Related Practice
Textbook Question
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Textbook Question
Methyl red has a pKa of 5.0 and is red in its acid form and yellow in its basic form. If several drops of this indicator are placed in a 25.0-mL sample of 0.100 M HCl, what color will the solution appear? If 0.100 M NaOH is slowly added to the HCl sample, in what pH range will the indicator change color?
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Open Question
Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For each of the following pH values, determine whether [In-] > [HIn] and predict the color of a phenolphthalein solution: a. pH = 2.0 b. pH = 5.0 c. pH = 8.0 d. pH = 11.0
Textbook Question
Referring to Table 17.1, pick an indicator for use in the titration of each base with a strong acid. a. CH3NH2
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Textbook Question
Write balanced equations and expressions for Ksp for the dissolution of each ionic compound. a. BaSO4
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Textbook Question
Write balanced equations and expressions for Ksp for the dissolution of each ionic compound. b. PbBr2
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