Using a laboratory burner


Many chemistry experiments require something to be heated. This is done with one of several types of laboratory burners. The lab burners at Mt. Lebanon High School use methane gas delivered through the gas outlets at student lab stations. a proper lab burner flame Before attempting to light any lab burner, check to see that the jet hole between the base and the burner tube is free of obstruction. If chemicals have covered this jet, the burner will not operate properly. After attaching the hose to the gas outlet, turn the handle on the outlet parallel to the nozzle to open the gas valve. The gas valve is turned off by turning the handle 90 degrees in either direction. Carefully check to see that you hear gas escaping from the mouth of the burner tube. When you are sure that you have gas, bring the head of the striker over the burner and squeeze the striker handle. The spark produced will ignite the gas and your burner is lit. Adjust the air control vent so that the flame has the proper color pictured here. A yellow flame is an indication of a lack of oxygen, meaning that the air vent needs to be opened. The hottest part of the burner flame is just at the top of the bright blue inner cone. Normal heating is done with an object at the top of the light blue outer cone, while strong heating is done with an object at the top of the bright blue inner cone. To heat a container gently, move the container back and forth through the outer cone.

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