General Chemistry Lab Safety
The chemistry laboratory can be a place of discovery and learning. However, by
the very nature of laboratory work, it can be a place of danger if proper
common-sense precautions aren't taken. While every effort has been made to
eliminate the use of explosive, highly toxic, and carcinogenic substances from
the experiments which you will perform, there is a certain unavoidable hazard
associated with the use of a variety of chemicals and glassware. You are expected
to learn and adhere to the following general safety guidelines to ensure a safe
laboratory environment for both yourself and the people you may be working near.
Additional safety precautions will be announced in class prior to experiments
where a potential danger exists. Students who fail to follow all safety rules may
be asked to leave the lab or suffer grading penalties.
- Safety goggles must be worn at all times while in the laboratory.
This rule must be followed whether you are actually working on an experiment or
simply writing in your lab notebook. You must wear safety goggles provided
by the chemistry department.
- Contact lenses are not allowed. Even when worn under safety goggles, various
fumes may accumulate under the lens and cause serious injuries or blindness.
- Closed toe shoes and long pants must be worn in the lab. Sandals and shorts
are not allowed.
- Long hair must be tied back when using open flames.
- Eating, drinking, and smoking are strictly prohibited in the laboratory.
- No unauthorized experiments are to be performed. If you are curious about
trying a procedure not covered in the experimental procedure, consult with your
- Never taste anything. Never directly smell the source of any vapor or gas;
instead by means of your cupped hand, waft a small sample to your nose. Do not
inhale these vapors but take in only enough to detect an odor if one exists.
- Coats, backpacks, etc., should not be left on the lab benches and stools.
There is a hook rack along the back wall at either end of the lab. There are coat
racks just inside the each entrance to the balance room at the back of the lab.
Beware that lab chemicals can destroy personal possessions.
- Always wash your hands before leaving lab.
- Learn where the safety and first-aid equipment is located. This includes
fire extinguishers, fire blankets, and eye-wash stations.
- Notify the instructor immediately in case of an accident.
Proper Handling of Chemicals and Equipment
- Consider all chemicals to be hazardous unless you are instructed
Safety Data Sheets (MSDS) are available in lab for all chemicals in use. These will
inform you of any hazards and precautions of which you should be aware.
- Know what chemicals you are using. Carefully read the label twice
before taking anything from a bottle. Chemicals in the lab are marked with
hazardous materials diamond labels. Learn how to interpret these labels.
- Excess reagents are never to be returned to stock bottles. If you
take too much, dispose of the excess.
- Many common reagents, for example, alcohols and acetone, are highly
flammable. Do not use them anywhere near open flames.
- Always pour acids into water. If you pour water into acid, the heat of
reaction will cause the water to explode into steam, sometimes violently, and the
acid will splatter.
- If chemicals come into contact with your skin or eyes, flush
immediately with copious amounts of water and consult with your instructor.
- Never point a test tube or any vessel that you are heating at yourself or
your neighbor--it may erupt like a geyser.
- Dispose of chemicals properly. Waste containers will be provided and their use
will be explained by your TA. Unless you are explicitly told otherwise, assume that
only water may be put in the lab sinks.
- Clean up all broken glassware immediately and dispose of the broken glass properly.
- Contact the stockroom for clean-up of mercury spills.
- Never leave burners unattended. Turn them off whenever you leave your
workstation. Be sure that the gas is shut off at the bench rack when you leave
- Beware of hot glass--it looks exactly like cold glass.