A Bunsen burner is a device used in the laboratory in producing a hot clean flame by burning a fuel gas in air. Glass bends are important tools in any laboratory work.

1. Bunsen Burner and Glass
Manipulation
By
Asso. Prof. Liwayway Memije-Cruz
CAS

2. 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).

3. Parts of a Bunsen burner

4. 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

5. 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

6. 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?

7. 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

8. Glass manipulation

9. 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.

10. 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.