Bunsen Burners

1
Bunsen Burners

• A Tutorial

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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

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Parts of the Flame
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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.

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Color Indicates Temperature

• Yellow flame (also called a safety flame) at
  around 1,000C.
• 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