FREEZING-POINT DEPRESSION OF A SOLUTION Description and Specifications for Lab Tenders
FREEZING POINT DEPRESSION OF A SOLUTION.
FREEZING-POINT DEPRESSION OF A SOLUTION The freezing point of a solution is always lower than that of
pure solvent. A specifi c instrument (cryoscope) will determine
freezing-point depression in experimental way.
If cryoscopic constants of solvent are known, the molecular
mass of dissolved substances can be determined.
TRAINING PROGRAM
• Raoult’s law
• cryoscopic constants
• chemical potential
• Gibbs-Helmholtz equation
• concentration ratio
• degree of dissociation
• Van’t Hoff factor
• cryoscopy
OBJECTIVES
• determining the value of freezing-point depression of a
solution after the dissolution of a strong electrolyte (NaCl)
in water. Comparing experimental and theoretical values
for this concentration will lead to determine the number of
ions involved in electrolyte dissociation
• determining the apparent molar mass of a non-electrolyte
from the value of freezing-point depression
COMPONENTS
• apparatus for freezing-point depression
• glassware
• chronometer
• 2 thermometers