Featured in PASCO’s College Chemistry Instructor Guide
College Instructor edition with 36 experiments covering introductory and general chemistry topics.
Use a colorimeter to determine the concentration of an ethanol solution using the Breathalyzer™ test: chemical oxidation of ethanol by acidic dichromate.
Students understand the chemical oxidation of ethanol by acidic dichromate, as used in Breathalyzer tests for alcohol, and determine the concentration of an ethanol solution.
Students gain experience conducting the following procedures:
Erlenmeyer flask, 125-mL - 7
Volumetric flask, 100-mL
Graduated pipet, 10-mL 1
Graduated pipet, 5-mL
Pipet, plastic, 1-mL
Graduated cylinder, 100-mL
Beaker, 25-mL - 2
Beaker, 400-mL - 2
Clamps, utility - 2
15% Sulfuric acid (H2SO4) -800 mL
Silver nitrate (AgNO3), 15% - 10 mL
5.10 × 10-2 M Potassium dichromate (K2Cr2O7) - 30 mL
Ethanol solution, unknown concentration - 5 mL
Wash bottle with distilled water
This experiment may require software and an interface for data collection.