Chemistry

17 Laboratory Safety Rules and precautions for chemistry labs

Learning outcomes of a practical work

As experiments are so important in the study of chemistry.we must make the science laboratory a safe place to work in.Students are required to carry out practical work as an integral part of the course. They are advised to maintain a laboratory record book in which they record all their practical work, the experimental arrangements used, the observations made and the analysis of these observations. Through experimental work the students are expected to acquire the skills as follows.

  • Adopt safety procedures in chemistry laboratory.
  • Handle chemical apparatus and use compounds and reagents etc.
  • Keep and store poisonous compounds properly.
  • Control explosivve reactions.
  • Determine melting point of organic solids.
  • Determine boiling point of organic liquids.
  • Carry out sublimation.
  • Carry out distillation process.
  • Prepare solutions of different strength.
  • Carry out dilution of solutions.
  • Determine which solutions conduct electricity from a set of different given solutions.
  • Perform metal displacement reactions in aqueous medium.
  • Perform a reaction for preparation of a binary compound from two elements.
  • Perform a decomposition reaction which produces new compounds.
  • Conduct exothermic and endothermic processes.

 General safety procedures

bellow are safety rules for working in the school, college or relevant laboratory.

Before you begin…….

  1. Keep your work table neat and clean. Make sure that it is not full of unnecessary things such as school bag, files, clothes and books etc.
  2. Read all the instructions in your paractical manual/ book before you do anything.
  3. Look out for possible safety precautions.

While you are doing the experiment

    • Follow the directions in the paractical manual/ book closely.
    • Do not wounder around and do not endanger people around you.
    • Wear or use protective devices that are provided to you. These protective devices include googles, gloves, apron and safety tongs.
    • Use wire gauze or sand bath for heating. Never leave heating apparatus unattended. Turn offf bunsen burner or spirit lamp when you have to leave your work table for a while or when you have finished your your experiment.
    • Handle the apparatus and other instruments particularly sharp objects to avoid damage and loss.
    • If you have broken any glassware (beakers, test-tubes or thermometer etc.) or split anything, report to your teacher at once.you have to help in cleaning up.
    • Be aware of where fire extinguishers, fire blankets and first aid box are located in the laboratory.
    • Leave schoolbags outside the laboratory.
    • Do not run around the laboratory.
    • Wear safety goggles and tie back long hair.
    • do not eat in the laboratory or even taste any chemical.
    • Always handle chemicals with a spatula, never your fingers.
    • Do not point a test-tube towards another student.
    • Clean up any apparatus or spilled chemical.
    • Always light a Bunsen burner with the air-hole closed.
    • Read all instructions carefully before doing the experiment.
    • Report any accidents immediately to your teacher.

After you have finished…..

  1. Turn off water and gas taps,disconnect electrical connections and return your apparatus to laboratory staff.
  2. Clean your work table again.
  3. Do not dispose of material in the sink unless you are instructed to do so.
  4. Wash your hands thoroughly.

Note: the best preventive measure is always to be careful and alert. Take care of yourself and neighbours.

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