Bunsen

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Bunsen Burner Lab: Tools of the Physical Scientist
Background:
Often a chemist needs to heat materials. The Bunsen Burner is one of the most efficientways of doing this. Burners come in a variety of designs but most operate on the principle of mixing gas with air to produce a hot flame. In this lab you will learn how to light and adjust a burnerflame and to locate the hottest part of the flame.

Parts of the Bunsen Burner:
A. B. C. D. E. F.

A Barrel – where gas and air are mixed Collar – adjust the air intake C Air intake openings – airenters here Gas Flow Valve – regulates flow of gas (can also be controlled from table gas valve) Gas intake tube – gas enters burner from table source. E Base – supports burner F

B D

Materials:spark lighter gloves Bunsen Burner 250 mL beaker support stand with ring 100mL graduated cylinder

wire screen metal thermometer

Problem to solve:

How do you light and adjust a Bunsen Burner?Where is the hottest part of a burner flame?

Procedure:
Part 1: Lighting the Burner
1. 2. 3. 4. 5. Connect the hose to the table outlet. Clear the area of all flammable objects (including clothingand your hair!) Turn the barrel so that the air intake openings are closed, and then open them three full turns. Close the gas flow valve at the bottom of the burner, and then open it three fullturns. Put on your goggles, open the gas valve on the table and light the burner. Adjust the barrel so that the flame is pale blue with a dark blue inner cone.

Part 2: The Experiment
1. 2. 3. 4. 5.Set up the support stand, ring, and wire screen as shown in the photos (see next page). Position the ring clamp so that the beaker is at the base of the flame (Position A). Put 100mL of water into thebeaker and record the starting temperature of the water on your data sheet. Heat the water for 2 minutes recording the temperature every 15 seconds. Repeat this procedure for positions B,C, and D...
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