Typically, cryoscopic experiments require the use of hazardous chemicals. -- With safety (and cost) in mind South American teacher Winston Dossetti developed this simple and accessible alternative. Students create a cryoscopic chamber using ethanol and ice. They collect freezing point data of ionic and molecular solutions at varying concentrations and compare their freezing point depression data with values from the CRC. Students learn that freezing point data is a colligative property - a property that depends on the concentration of particles in a solution but not the identity of the solute. -- Includes: salt, plastic bottles, test tubes, glucose, sucrose, can coolers, instructions. Required but not included: distilled water, ice, ring stand, thermometer clamp, digital thermometer (47306-00), ethanol (95065-06). |
