USE THE EQUIPMENT PROVIDED IN THE MANNER IN WHICH IT WAS INTENDED.
If you have questions about the appropriate piece of equipment to use, ask your instructor.
To consider the most important first: One must be considerate of his/her fellow worker in the laboratory because the nonreplaceable eyes are particularly susceptible to permanent damage. Always think of the consequences of the unpredictable accident; be cognizant of the direction of the force of your reaction if it does fail.
Remember your own best personal protection comes in the form of safety goggles and accident insurance. Another point of consideration to your fellow student and instructor is to use the hood when necessary. Vapors can be not only temporarily unpleasant but harmful to the lungs and membranes in the respiratory system. [See Safety Section for further cautions.]
Basic techniques are given for instructional and illustrative purposes as well. All operations cannot be covered here, but one should be able to develop other techniques on his/her own as necessary.
a liquid from a bottle
Obtain liquids in a clean dry beaker---not a test tube or graduated cylinder. Do not put pipettes or medicine droppers into reagent bottles. Do not take reagent bottles to your desk. Do not take more material than is required, for many of the chemicals used in the laboratory are costly, and disposal of excess chemicals is not only expensive, but bad for the environment. When carefully transferring liquids, pour the liquid down a stirring rod held across the top of the beaker from which one is pouring.
NEVER RETURN UNUSED LIQUIDS TO THE REAGENT BOTTLE: Place them in a container as designated by your instructor for proper disposal of the liquid or, if so instructed, flush them down the laboratory sink using a large quantity of water.
solids from a bottle
Do not take reagent bottles to your desk. Do not take more material than is required for many of the chemicals used in the laboratory are costly, and disposal of excess chemicals is not only expensive, but bad for the environment.
NEVER RETURN UNUSED SOLIDS TO THE REAGENT BOTTLE: Place them in the container designated by your instructor or, if so instructed, in the waste crock.
of the balance
of the thermometer