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Chemistry / Why calcium chloride cannot be used to dry ammonia gas?
« on: 05/03/2010 00:19:56 »
does that mean formation of calcium complex ion? with NH3 as ligand?
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as you 've said, both electrons are donated by one atom.in the NH4+ case, the empty orbital of the H+ ion is filled by the electrons from the N rite?QuoteThe term complex in chemistry, also called a "coordination compound" or "metal complex", a structure consisting of a central atom or molecule connected to surrounding atoms or molecules. Originally, a complex implied a reversible association of molecules, atoms, or ions through weak chemical bonds. As applied to coordination chemistry, this meaning has evolved. Some metal complexes are formed virtually irreversibly and many are bound together by bonds that are quite strong.http://en.wikipedia.org/wiki/Complex_(chemistry)
Whereas we're talking about a co-ordination covalent bond, in which both electrons are donated by one atom. So its pretty confusing to tell the difference between the two [] [] []
So Mr. lancenti was correct []
A stigma is a part of a flower, I think you mean sigma...yeah, thx for correcting it ==
oo, the toxicity of these gases.., um..Yes, there are many. Much used in work safety is the "TLV": Threshold Limiting Value, which can be "TWA" = Time Weighted Average, or "STEL" = Short Time Extended Limit:
are there any numbers that can compare the toxicity of gases(or toxins)? i really don't know ..
For CO, TLV-TWA = 60 ppm
For NO2, TLV-TWA = 3 ppm
It means that in those conditions and intended in that sense NO2 is 20 times more toxic than CO.
In high concentrations the relative toxicities are probably much different, however those numbers can give you an idea.