Effect of Temperature on Solubility of Salts in Water
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Questions and Answers

What happens to the solubility of a solid that absorbs heat when dissolved as temperature increases?

  • Remains constant
  • Decreases
  • Becomes insoluble
  • Increases (correct)
  • In an exothermic solution process, what happens to the solubility of a compound as the temperature rises?

  • Becomes insoluble
  • Decreases (correct)
  • Increases
  • Remains constant
  • What happens to the solubility of Na2SO4.10H2O as the temperature exceeds 32°C?

  • Increases
  • Becomes insoluble
  • Decreases (correct)
  • Remains constant
  • What type of reaction occurs when sodium chloride dissolves in water?

    <p>Isothermic</p> Signup and view all the answers

    Which compound exists as an anhydrous salt above a certain temperature point?

    <p>Sodium sulfate</p> Signup and view all the answers

    If a solid belongs to the class of compounds that absorb heat when they dissolve, what can be said about its solubility?

    <p>Solubility increases with temperature</p> Signup and view all the answers

    What happens to the solubility of phenobarbital sodium as the pH is lowered below 9.3?

    <p>It decreases</p> Signup and view all the answers

    How do weak bases react with dilute acids?

    <p>Decrease the pH</p> Signup and view all the answers

    How do weak acids react with dilute alkalis?

    <p>Form water-soluble salts</p> Signup and view all the answers

    According to the Henderson-Hasselbach equation, what happens to the pH of a system when the concentration of the molecular acid increases?

    <p>pH decreases</p> Signup and view all the answers

    What is the relationship between pH and pKa when the concentrations of salt and acid are equal?

    <p>pH = pKa</p> Signup and view all the answers

    How can maximum therapeutic effectiveness be achieved in drug preparations according to the text?

    <p>By adjusting preparations to an optimum pH</p> Signup and view all the answers

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