Lighting a Bunsen Burner

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Slide 2

Technique – Bunsen burner setup Burner Tubing - should have no cuts or deep cracks so that gas would leak. Barrel – adjusts air Main gas valve – turns gas on or off Needle valve – adjusts fuel (gas) and height of flame

Slide 3

Technique – Bunsen burner setup Examine the Bunsen burner tubing for cuts and deep cracks. Screw the barrel and the needle-valve all the way in (closed), then OPEN then about 1 turn. Attach the burner tubing securely to the main gas valve.

Slide 4

Technique – Lighting a Bunsen burner Turn the petcock until it points to the rubber hose and then…… Closed Open

Slide 5

Technique – Lighting a Bunsen burner ……. Hold a striker just above the barrel top, and squeeze the striker handle to create a spark.

Slide 6

Technique – Adjusting a Bunsen Burner Adjust the flame. With the barrel screwed all the way in, the flame will be very “cool” and yellow. Adjust the flame with the needle-valve (fuel) and barrel (air). Yellow, “luminous” flame Dirty Not very hot

Slide 7

Technique – Adjusting a Bunsen Burner With the barrel screwed all the way in, the flame will be very “cool” and yellow. To adjust the flame the needle-valve (fuel) and barrel (air) will need to be adjusted. Unscrew the barrel (holding the base of the barrel) until the flame forms two cones. The height of the flame can be raised by opening the needle valve (fuel). The barrel will then need to be adjusted to allow more air to mix with the fuel. (Don’t add so much air that your hear a “roar.” Your flame should be “silent” and blue. To most efficiently heat a sample, the tip of the inner blue cone should be touching the object to be heated.

Slide 8

Perfect Flame - Silent, blue (non-luminous) Tip of inner cone is the hottest part of the flame Not very hot Outer cone – not very hot The tip of the inner blue cone should be touching the object to be heated.

Summary: Steps to lighting a Bunsen burner

Tags: chemistry

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