Chemical safety
From HvWiki
All big accidents happen unexpectedly and they are often the result of several failures of equipment or procedure that does not seem very dangerous when viewed separately. Always pay attention to the details.
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Materials Safety Data Sheets
Anyone doing real chemistry (amateur or professional) should have Materials Safety Data Sheets (MSDSs) for every chemical used, and every common byproduct. These provide a useful summary of the properties of a chemical, as well as giving important safety information. As a side benefit, an MSDS file is a convenient place to jot down any interesting facts or reactions of a chemical. MSDSs are easily available on the web.
Glassware
Glassware fails for no obvious reason from time to time. The experiment should be set up so that it is still safe even if there is a failure. Always have a plan ready for what to do in that case.
Storage of chemicals
Chemicals should be stored labelled and safely. Safely means safe for anyone (children, blind people, colour blind people and morons) at present or in the future. If you get run over by a car it should be possible for someone that have no idea what they are doing to safely dispose of the chemicals. Ask yourself, what happens if there is a fire, earthquake or hurricane.
Migration of chemicals
Some chemicals have a remarkable ability to migrate and spread over a larger area and can still surface years after a small spill.
Disposal of chemicals
Always store unwanted chemicals safely until you have a safe method of disposal.
