Bunsen Burner

Parts of the Bunsen Burner

Lighting Bunsen Burner Connect tube from Bunsen burner to desk outlet valve. Close needle valve and collar. Open desk outlet valve fully. Open needle valve 1/2 turn. Use the spark lighter to light the flame. Adjust collar and needle valve till you see a blue flame. Check that the holes are closed.  The holes can be adjusted to let in more or less air by turning the collar 

Adjusting the flame Close the Barrel  Less oxygen  weaker, yellow flame. Open the barrel  More oxygenated blue flame – Blue flame is desired: hotter and more controlled

3 Flames of a Bunsen Burner: Safety Flame “Coolest" flame is a yellow / orange color. Approximately 300°C. It is never used to heat anything, only to show that the Bunsen burner is on.

3 Flames of a Bunsen Burner Normal Flame, Medium flame, or blue flame or the invisible flame. difficult to see in a well-lit room.  most commonly used flame. approximately 500°C.

3 Flames of a Bunsen Burner Roaring blue flame.  Characterized by a light blue triangle in the middle only flame of the 3 which makes a noise.  Hottest flame, approximately 700°C.

Types of Flames Air hole open Roaring flame To heat things up fast Type of Flame When do we use this type of flame? Air hole open Roaring flame To heat things up fast Air hole half open Blue flame To gently heat things up Air hole closed Yellow safety flame When we are not using it

Parts of the Bunsen Burner barrel  collar - controls the amount of oxygen (more oxygen, more intense and blue the flame) air holes  gas intake hose gas valve – adjusts amount of gas (more gas, the larger the flame) base - keeps burner from making contact with work surface.

Bunsen Burner Safety 1. Always open the desk outlet valve fully and regulate the gas supply to the burner by the needle valve. 2. Always extinguish your burner by turning off the desk outlet valve (and then closing the needle valve and barrel.) If there is an accident always shut off the desk outlet valve immediately. After you have adjusted it for the flame needed move it into position. Designate one person in group who will be responsible for maintaining the burner and flame.

Perfect Flame for Bunsen Burner narrow plume of pale blue flame. any tint of orange color means that either not enough gas is flowing through the burner or not enough air is being mixed with the gas. An orange flame will not be hot enough for most laboratory purposes. A flame with a bright blue triangle within a pale blue flame is too hot for most experiments, although it may be desirable for specific tasks requiring a great deal of heat.

Label the parts of the Bunsen Burner Barrel Gas Valve Hose Collar Air Intake Holes Base Needle Valve