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Hello, my daughter is a senior in high school.  She has a research project due on lithium nitrate.  It seems to be a very difficult compound to locate information about.  We have found a little, but still need information on the solubility of lithium nitrate, hydration, and decomposition information.  Can you help us?

I did some snooping around and here's what I found out:
LiNO₃ is soluble is water, 95% ethanol (ethyl alcohol), and ammonia.  It may also be soluble in some other organic solvents, but these one for certain.
It most likely decomposes at about 500 ⁰C by the following reaction:
2LiNO₃ (s) ---> 2LiNO₂ (s) + O₂ (g)
Hydrates can be formed by the attachment of 3 water molecules, but I don't know the reaction conditions.  It may just absorb water from the air, but maybe not.  If you have some and it begins to "grow" a film when exposed to air, this is what is happening.
LiNO₃ + 3H₂O ---> LiNO₃.3H₂O (the water molecules literary become attached to the lithium nitrate)
If you need more information, check a public library for a book called the "Merch Index", or contact a company that manufactures the chemical.  They should be able to answer your questions as well.