what is a good site online to get hazards/precautions for a wide range of chemicals?

Question

for example i need to know the hazards of sodium phenoxide and many others.

Answer 1

Download this guide free
http://www.cdc.gov/niosh/npg/

Answer 2

You can get the MSDS for a very, very large variety of chemicals by visiting the home page of manufacturers or distributors. The MSDS is the Materials Safety Data Sheet and included the information you seek.

However, there is also an online MSDS search. You can find that at http://www.msdssearch.com/msdssearch.htm.

Another clearinghouse of information can be found at http://www.ilpi.com/msds/.