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Boiling Point Elevation quiz

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  • What is boiling point elevation?
    Boiling point elevation is the phenomenon where adding a solute to a pure solvent increases the boiling point of the solvent.
  • What happens to the boiling point of a solvent when more solute is added?
    The boiling point of the solvent increases as more solute is added.
  • What is the normal boiling point (bp) of a solvent?
    The normal boiling point is the boiling point of the pure solvent before any solute is added.
  • How is the boiling point of a solution (bp solution) defined?
    The boiling point of a solution is the boiling point of the solvent after the addition of a solute.
  • What is the formula for boiling point elevation?
    The formula is Δt_b = i × k_b × m, where Δt_b is the change in boiling point, i is the van't Hoff factor, k_b is the boiling point constant, and m is the molality.
  • What does the van't Hoff factor (i) represent in the boiling point elevation formula?
    The van't Hoff factor (i) represents the number of particles into which a solute dissociates in solution.
  • What is the boiling point constant (k_b) and its units?
    The boiling point constant (k_b) is a property of the pure solvent, with units of degrees Celsius per molality (°C/m).
  • How is molality (m) defined in the context of boiling point elevation?
    Molality is defined as moles of solute per kilogram of solvent.
  • How do you calculate the boiling point of a solution?
    Add the change in boiling point (Δt_b) to the normal boiling point of the pure solvent.
  • Name four common solvents used in boiling point elevation problems.
    Water, benzene, chloroform, and ethanol are commonly used solvents.
  • What happens to the boiling point of water when a solute is added?
    The boiling point of water increases when a solute is added.
  • Do you need to memorize the k_b values for common solvents?
    No, you do not need to memorize the k_b values; they are usually provided in problems.
  • What is the van't Hoff factor (i) for a covalent, non-volatile, or non-ionic compound?
    For such compounds, the van't Hoff factor (i) is typically 1.
  • Why does adding a solute to a solvent elevate its boiling point?
    Adding a solute disrupts the solvent's ability to vaporize, requiring a higher temperature to boil.
  • What are the key variables needed to solve a boiling point elevation problem?
    You need the van't Hoff factor (i), boiling point constant (k_b), and molality (m) of the solution.