Question

Experiment to determine induction period of gasoline by using a machine

Answer 1

Materials needed:
- Gasoline sample
- Machine capable of measuring induction period (e.g. Rancimat)
- Glass vials
- Stopwatch
- Thermometer

Procedure:
1. Place the machine in a well-ventilated area and ensure it is set up properly according to the manufacturer’s instructions.
2. Set the temperature on the machine to the desired test temperature (typically around 110°C for gasoline).
3. Measure out a small amount of gasoline sample (approximately 2-3 ml) and transfer it into a clean glass vial.
4. Place the vial containing the gasoline sample into the machine’s sample holder.
5. Start the machine and record the initial temperature of the test.
6. Observe the machine’s display and note the time it takes for the induction period to occur. The machine will typically show a sharp increase in conductivity and/or a rapid change in temperature when the induction period ends.
7. Stop the machine and record the time taken for the induction period to occur.
8. Repeat the experiment with multiple gasoline samples to ensure accuracy and repeatability.
9. Calculate the average induction period for the gasoline samples tested.

Results:
The induction period of gasoline can vary depending on factors such as the composition of the gasoline, impurities present, and storage conditions. By conducting this experiment, the induction period of a gasoline sample can be determined, providing valuable information about its stability and resistance to oxidation.