Product details

Freezing point depression

Freezing point depression

Item no.: P3021101
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Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
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Principle

The freezing point of a solution is lower than that of the pure solvent. The depression of the freezing point can be determined experimentally using a suitable apparatus (cryoscopy). If the cryoscopy constants of the solvent are known, the molecular mass of the substance dissolved can be determined.

Benefits

  • All relevant measured variables at a glance
  • Experimentation made easy by intuitive operation
  • With detailed experiment guide

Tasks

  1. Determine the size of freezing point depression after dissolving a strong electrolyte (NaCl) in water. By comparing the experimental value with the theoretical one predicted for this concentration, determine the number of ions into which the electrolyte dissociates.
  2. Determine the molar mass of a non-electrolyte (hydroquinone) from the value of freezing point depression.

What you can learn about

  • Raoult's law
  • Cryoscopic constant
  • Chemical potential
  • Gibbs-Helmholtz equation
  • Concentration ratio
  • Degree of dissociation
  • Van't Hoff factor

Necessary accessories

  • Precision balance 620g/0.001g
Document     Filesize
p3021101e.pdf Experiment guide, English 357.47 KB

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