Unattended experiments which could pose a safety hazard should a problem occur, especially outside of normal working hours, should be kept to an absolute minimum.
Before an experiment is left unattended, take precautions to prevent spills, ‘floods’ or fires in case of mechanical, power, or water failure. Secure water and vacuum hoses with a band clamp (not ‘wire’) on each connection, and make sure water outlet tubing is securely inserted into sink drains to a depth of at least 12" (~30 cm). Use tygon or polypropylene (not ‘rubber’) tubing for all water flow.
A reaction mixture must be clearly identified, and clear written instructions should be left outlining handling procedures in case an emergency shutdown is required or there are other problems.
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