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Bunsen Burners

Learn the ins and outs of using a Bunsen burner for sample heating. Discover the parts, flame adjustments, color indicators, and more in this detailed tutorial.

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Bunsen Burners

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  1. Bunsen Burners A Tutorial

  2. Bunsen Burner • A bunsen burner is used for heating samples. • The fuel is natural gas.

  3. Parts of a Bunsen Burner • The parts of the burner include: • gas inlet • burner tube (adjustable) • air control vent • gas control valve

  4. Lighting a Bunsen Burner • To light the burner, • step 1: turn on the gas • step 2: open the gas control valve 1/4 to 1/2 turn • step 3: hold the striker at a 45o angle and ignite the flame

  5. Parts of the Flame

  6. Adjusting the Flame • Air adds Oxygen which is necessary for combustion • To make the flame burn hotter and larger, open the air mixture valve accordingly • To make the flame burn cooler and smaller, close the air mixture valve accordingly • Opening the gas valve will add more fuel to the mixture but not more Oxygen, and cause incomplete combustion

  7. Color Indicators • Different flame types of a Bunsen burner depend on oxygen supply. • What does the flame on the left tell you? • A rich fuel mixture with no premixed oxygen, incomplete combustion produces a yellow sooty flame. • What does the flame on the right tell you? • A fuel and oxygen mixture allows for complete combustion and a hot, blue flame.

  8. Color Indicates Temperature • Yellow flame (also called a safety flame) at around 1,000°C. • Increasing oxygen supply creates a blue appearance • The coolest part of a flame will be red, then progress to orange, yellow, and white as the temperature increases

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