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:
- Carrying out a reaction between ethanol and potassium chromate that uses a catalyst and hot water bath to increase the rate of reaction.
- Developing a calibration curve using spectroscopic measurements to use for calculating the concentration of an ethanol solution.
- Advanced preparation of solutions.
Sensors / Equipment Used:
Our PASPORT Colorimeter records all 4 wavelengths simultaneously--no need to guess at wavelength to get a quality measurement.
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
The Associated Bundle:
Contains the probeware for completing experiments in the College Chemistry lab manual.