Bunsen Burner and Glass

Manipulation

By Asso. Prof. Liwayway Memije-Cruz

CAS

What is a Bunsen burner?

a device for the production of a hot

clean flame by burning a fuel gas in

air.

discovered by Robert Bunsen

a common laboratory equipment

which produces a single open gas

flame used for heating, sterilization,

and combustion

used with methane or LPG

(propane, butane , or a mixture of

both).

Parts of a Bunsen burner

Three distinct zones (cones) of a

Bunsen burner outer oxidizing

zone which is

purple in color

middle reducing

zone (region of

incomplete

combustion)

inner zone

consists of

unburned gases

How to use a Bunsen burner Check for safety – wear your laboratory gown and

goggles on, long hair should be tied back, books and papers should be away from the flame, and the apparatus set up should not be too close to the edge of the table...

Check that the holes are closed. The holes can be adjusted to let in more or less air by turning the collar

Light the Bunsen burner using your match

Turn on the gas tap. To turn it on, you must first push down, then turn the tap. This is a safety feature so the taps are not accidentally pushed open. Bring the match to the top of the Bunsen burner.

Adjust the flame by turning the collar so that you have the appropriate flame for the experiment.

Be vigilant to avoid accident inside the laboratory

Questions:

1. Which flame is best for heating?

2. When flame strikes back, what

course of action should you take?

3. Name at least 3 precautionary

measures to be observed when

operating a Bunsen Burner?

Glass manipulation/glass

bends Very important tools in

laboratory works

Serve in drewing out

liquid from a wash bottle

Serve as delivery tube in

Hydrogen and Oxygen

gases generation

Carbon dioxide train and

in other laboratory

operation that requires

transport of fluids either

gas or liquid

Glass manipulation

Glass bends

A functional bend must have a good curvature.

The size of the angle depends upon the purpose for which bends are used.

For a wash bottle 600

is ideal.

For a delivery tube 500 is recommended.

Questions:

Enumerate the

steps involved in

preparing a

glass bend.

What is the

importance of

wing top in glass

bending?

Give some uses

of glass bends.