About this video

• Video Title: How to SAFELY light a Bunsen Burner: Safety in the Lab -4
• Channel: Chem Jen
• Speakers: Jen
• Duration: 00:09:34

Overview

This video provides a comprehensive guide on how to safely operate a Bunsen burner. It covers the essential parts of the burner, the importance of the correct air-to-gas mixture for an optimal blue flame, and the procedure for lighting it using a flint striker. The video also demonstrates the temperature difference between a proper blue flame and a less efficient yellow flame by attempting to melt a penny.

Key takeaways

• Bunsen Burner Safety: Always ensure the gas control knob is perpendicular (90-degree angle) to indicate it is off. The gas is only on when the knob is not at a 90-degree angle.
• Master Gas Shut-off: A master switch is available to turn off all gas supply in an emergency.
• Bunsen Burner Anatomy: Key parts include the gas inlet, the needle valve for gas control, and the barrel with an adjustable collar to control airflow.
• Ideal Flame: The desired flame is a stable blue cone, indicating the correct mixture of gas and air, capable of reaching approximately 1800 degrees Celsius.
• Lighting Procedure: Use a flint striker to create a spark. Turn on the gas and count to five. If the burner doesn't light within five seconds, turn off the gas, waft the area, and wait before trying again. It's recommended to have one person control the gas and another operate the striker.
• Flame Adjustment: Adjusting the collar on the barrel controls the air intake. Too little air results in a yellow, less hot "lame" flame, while the correct amount of air produces a hot, blue flame.
• Temperature Demonstration: A penny, primarily made of zinc, was used to demonstrate the heat of the blue flame, showing that it can melt the penny's zinc component.

Here are five procedures for safely lighting and using a Bunsen burner, as described in the video:

1. Check Gas Control: Before lighting, ensure the gas control knob is in the perpendicular (90-degree) position, indicating it is off.
2. Two-Person Lighting: Have one person manage the gas flow and another operate the flint striker.
3. Controlled Gas Flow: Turn on the gas and immediately count to five. If the burner does not ignite within this time, turn off the gas, waft the area to clear any gas, and wait before attempting to light it again.
4. Create a Spark: Use a flint striker with a two-hand technique, applying pressure with one thumb to move the striker back and forth, generating a spark near the burner's top.
5. Adjust for Blue Flame: Once lit, adjust the collar on the barrel to allow air to mix with the gas. The goal is to achieve a stable blue flame with an inner blue cone, which is the hottest part of the flame.

The video doesn't discuss the theory behind why different metal salts produce different flame colors, nor does it go into detail about the behavior of electrons within metal salts when exposed to a Bunsen flame. The experiment shown focuses on demonstrating the temperature of a Bunsen burner's flame by melting a penny and adjusting the flame's appearance based on the air-to-gas mixture. Therefore, I cannot provide a paragraph on that specific topic based on the provided transcript.

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