CH 17: Hydrolysis
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Questions and Answers

What is the fundamental process described in the given text?

  • Dehydration
  • Hydrolysis (correct)
  • Oxidation
  • Neutralization
  • Which of the following statements accurately describes the mechanism of hydrolysis?

  • Hydrolysis is a process that always results in the formation of acidic solutions.
  • Hydrolysis involves the breaking of covalent bonds in water molecules.
  • Salts are formed by the reaction of acids and bases.
  • When dissolved in water, salts can undergo hydrolysis, leading to the formation of new ions. (correct)
  • What is the result of hydrolysis when a salt of a weak acid and a strong base is involved?

  • The solution becomes acidic.
  • The solution becomes alkaline. (correct)
  • The solution becomes neutral.
  • The solution remains unchanged.
  • Which of the following is an example of a salt of a weak acid and a strong base mentioned in the text?

    <p>Sodium ethanoate (NaCH3COO)</p> Signup and view all the answers

    What happens to the anions from the weak acid during the hydrolysis of a salt of a weak acid and a strong base?

    <p>They accept protons from water, producing hydroxide ions.</p> Signup and view all the answers

    Which of the following statements is true about the pH of a solution containing a salt of a strong acid and a weak base?

    <p>The solution will have a pH less than 7.</p> Signup and view all the answers

    What is the significance of understanding hydrolysis reactions?

    <p>All of the above.</p> Signup and view all the answers

    Which of the following statements is true about the ions present in salts?

    <p>Cations are derived from the base, and anions are derived from the acid.</p> Signup and view all the answers

    What is the primary factor that determines the pH of a solution containing a hydrolyzed salt?

    <p>The nature of the acid and base that formed the salt.</p> Signup and view all the answers

    Which of the following statements accurately describes the role of water in hydrolysis reactions?

    <p>Water molecules provide protons for the dissociation and recombination of ions.</p> Signup and view all the answers

    What is the characteristic of a solution formed by the hydrolysis of a salt of a strong acid and a weak base?

    <p>The solution has a pH less than 7.</p> Signup and view all the answers

    In the hydrolysis of ammonium chloride (NH4Cl), which ion reacts with water to produce hydronium ions (H3O^+), lowering the pH?

    <p>NH4^+</p> Signup and view all the answers

    Which of the following factors does NOT influence the extent of hydrolysis and the resulting pH of a salt solution?

    <p>Pressure of the system</p> Signup and view all the answers

    In the hydrolysis of sodium ethanoate (NaCH3COO), which ion reacts with water to increase the solution's pH?

    <p>CH3COO^-</p> Signup and view all the answers

    Which of the following salts would result in a neutral solution with a pH of approximately 7 upon hydrolysis?

    <p>Sodium chloride (NaCl)</p> Signup and view all the answers

    In which field is understanding salt hydrolysis particularly important?

    <p>All of the above</p> Signup and view all the answers

    What is the primary reason for the acidic nature of a solution formed by the hydrolysis of a salt of a strong acid and a weak base?

    <p>The presence of hydronium ions (H3O^+)</p> Signup and view all the answers

    In the hydrolysis of sodium chloride (NaCl), which ion is considered 'spectatorial' and does not significantly react with water?

    <p>Both Na^+ and Cl^-</p> Signup and view all the answers

    Which of the following statements about the hydrolysis of salts is correct?

    <p>The nature of the salt determines whether the solution becomes acidic, basic, or remains neutral.</p> Signup and view all the answers

    What is the chemical reaction that occurs during the hydrolysis of ammonium chloride (NH4Cl)?

    <p>NH4Cl + H2O → NH3 + H3O^+ + Cl^-</p> Signup and view all the answers

    What is the primary outcome of the hydrolysis of a salt of a weak acid and a strong base?

    <p>The solution becomes alkaline with a pH greater than 7.</p> Signup and view all the answers

    What is the primary mechanism by which a salt of a strong acid and a weak base becomes acidic upon hydrolysis?

    <p>The cations from the weak base react with water to produce hydronium ions (H3O^+).</p> Signup and view all the answers

    Which of the following is an example of a salt of a weak acid and a strong base mentioned in the text?

    <p>Sodium ethanoate (NaCH3COO)</p> Signup and view all the answers

    What is the primary factor that determines the pH of a solution containing a hydrolyzed salt?

    <p>The strength of the acid and base used to form the salt.</p> Signup and view all the answers

    What is the characteristic of a solution formed by the hydrolysis of a salt of a weak acid and a strong base?

    <p>The solution becomes alkaline with a pH greater than 7.</p> Signup and view all the answers

    Which of the following statements accurately describes the role of water in hydrolysis reactions?

    <p>Water acts as a solvent, dissolving the salt and allowing the hydrolysis reaction to occur.</p> Signup and view all the answers

    What is the primary reason for the acidic nature of a solution formed by the hydrolysis of a salt of a strong acid and a weak base?

    <p>The cations from the weak base react with water to produce hydronium ions (H3O^+).</p> Signup and view all the answers

    In the hydrolysis of ammonium chloride (NH4Cl), which ion reacts with water to produce hydronium ions (H3O^+), lowering the pH?

    <p>The ammonium ion (NH4^+)</p> Signup and view all the answers

    Which of the following statements is true about the ions present in salts?

    <p>Salts consist of both cations and anions.</p> Signup and view all the answers

    In the hydrolysis of sodium chloride (NaCl), which ion is considered 'spectatorial' and does not significantly react with water?

    <p>The chloride ion (Cl^-)</p> Signup and view all the answers

    Which ion from a weak base donates protons to water during the hydrolysis of a salt of a strong acid and weak base?

    <p>The cation from the weak base</p> Signup and view all the answers

    What is the primary reason for a neutral solution with a pH of approximately 7 in the case of a salt of a strong acid and a strong base?

    <p>Both the cation and anion are spectatorial and do not significantly react with water</p> Signup and view all the answers

    Which of the following is the primary factor that determines the pH of a solution containing a hydrolyzed salt?

    <p>The nature of the salt itself</p> Signup and view all the answers

    In the hydrolysis of sodium ethanoate (NaCH3COO), what is the reaction that increases the solution's pH?

    <p>CH3COO^- + H2O → CH3COOH + OH^-</p> Signup and view all the answers

    Which of the following reactions occurs during the hydrolysis of ammonium chloride (NH4Cl)?

    <p>NH4^+ + H2O → NH3 + H3O^+</p> Signup and view all the answers

    Which of the following statements is true about the ions present in salts?

    <p>The reactivity of the ions depends on the nature of the salt</p> Signup and view all the answers

    Which of the following factors does NOT influence the extent of hydrolysis and the resulting pH of a salt solution?

    <p>The color of the salt solution</p> Signup and view all the answers

    What is the result of hydrolysis when a salt of a weak acid and a strong base is involved?

    <p>The solution becomes basic</p> Signup and view all the answers

    Which of the following fields is particularly important for understanding salt hydrolysis?

    <p>Environmental Science</p> Signup and view all the answers

    What is the significance of understanding hydrolysis reactions?

    <p>It is essential for predicting and controlling the pH of solutions</p> Signup and view all the answers

    Which property of a salt determines whether its hydrolysis will result in an acidic, basic, or neutral solution?

    <p>The nature of the salt ions</p> Signup and view all the answers

    What is the primary reason for the acidic nature of a solution formed by the hydrolysis of a salt of a strong acid and a weak base?

    <p>The cations from the weak base donate protons to water, forming hydronium ions (H3O^+) and lowering the pH</p> Signup and view all the answers

    Which of the following is an example of a salt of a weak acid and a strong base mentioned in the text?

    <p>Sodium ethanoate (NaCH3COO)</p> Signup and view all the answers

    What is the primary mechanism by which a salt of a strong acid and a weak base becomes acidic upon hydrolysis?

    <p>The cations from the weak base donate protons to water, forming hydronium ions (H3O^+)</p> Signup and view all the answers

    Which of the following statements accurately describes the role of water in hydrolysis reactions?

    <p>Water reacts with the salt ions to produce new chemical species</p> Signup and view all the answers

    What is the primary factor that determines the pH of a solution containing a hydrolyzed salt?

    <p>The strength of the parent acid and base</p> Signup and view all the answers

    Which of the following statements is true about the ions present in salts?

    <p>The cations and anions in a salt can be from either a strong or weak acid/base</p> Signup and view all the answers

    What is the primary reason for the neutral pH of approximately 7 in the case of a salt of a strong acid and a strong base?

    <p>The cations and anions from the strong acid and strong base do not significantly react with water</p> Signup and view all the answers

    Which of the following fields is particularly important for understanding salt hydrolysis?

    <p>Environmental science</p> Signup and view all the answers

    What is the primary outcome of the hydrolysis of a salt of a weak acid and a strong base?

    <p>The solution becomes basic</p> Signup and view all the answers

    Which of the following statements accurately represents the hydrolysis of a salt of a weak acid and a strong base?

    <p>The anions from the weak acid accept protons from water, producing hydroxide ions (OH^-), increasing the solution's pH.</p> Signup and view all the answers

    In the hydrolysis of ammonium chloride (NH4Cl), which of the following ions reacts with water to produce hydronium ions (H3O^+), lowering the pH?

    <p>NH4^+</p> Signup and view all the answers

    Which of the following statements accurately describes the role of water in hydrolysis reactions?

    <p>Water acts as both a proton donor and acceptor, facilitating the transfer of hydrogen ions between the salt ions.</p> Signup and view all the answers

    What is the primary reason for the acidic nature of a solution formed by the hydrolysis of a salt of a strong acid and a weak base?

    <p>The cations from the weak base donate protons to water, producing hydronium ions (H3O^+), lowering the pH.</p> Signup and view all the answers

    In the hydrolysis of sodium ethanoate (NaCH3COO), what is the reaction that increases the solution's pH?

    <p>CH3COO^- + H2O CH3COOH + OH^-</p> Signup and view all the answers

    Which of the following statements about the hydrolysis of salts is correct?

    <p>The hydrolysis of salts can produce solutions with pH values above or below 7, depending on the strength of the acid and base involved.</p> Signup and view all the answers

    What is the chemical reaction that occurs during the hydrolysis of ammonium chloride (NH4Cl)?

    <p>NH4^+ + H2O NH3 + H3O^+</p> Signup and view all the answers

    Which of the following statements accurately describes the mechanism of hydrolysis?

    <p>Hydrolysis involves the transfer of protons between the salt ions and water molecules, leading to the formation of new ions.</p> Signup and view all the answers

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