Why would heating a hydrated salt not always be a good method of removing water from it?
2007-02-09 01:18:55 · 3 answers · asked by John C 2 in Science & Mathematics ➔ Chemistry
If the salt is temperature sensitive, it may degrade during extended heating. This isn't the case with most inorganic salts, which are typically very stable and have high melting points.
If you have an organic molecule in a salt form (ie an amine / acid) like many pharmaceutical products, they will be susceptible to heat degradation. You can sometimes drive off the water by drying under vacuum, co distillation with toluene, or by recrystallizing in a water miscible solvent. The exact technique will vary based on the molecule in question.
2007-02-09 01:38:05 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Heating the salt is okay actually.
but the hydrate may have one H2O molecule
attached to it via some intermolecular force which may make it difficult to remove that H2O molecule
eg:
CuSO4.5H2O
one H2O is attached more strongly than the other four.
2007-02-09 01:31:02 · answer #2 · answered by vatsa 2 · 0⤊ 0⤋
recrystallization the hydrate from water. not heating because it may give dehydration.
2007-02-09 01:40:02 · answer #3 · answered by myyahoo! 2 · 0⤊ 1⤋