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Inorganic Chemistry

Blazing goIITian

Joined:	16 Mar 2008
Post:	1801

23 Oct 2008 17:36:45 IST

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733

analysis of silicate salts..

None

plzz guyz..

i want a tests for detecting an conforming presence of silicate salts..

the salt will be probably magnesium silicate...

plzz help me..

rates assured,...

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Archith.N

Cool goIITian

Joined: 23 Oct 2008

Posts: 64

23 Oct 2008 18:05:00 IST

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Question - How does one test for the presence of silicate?
---------------------------------------------------------
The test rock hounds use for identifying silica and silicates is one I will mention
because it appears in the print and Internet literature; however, I do not recommend it
unless adequate safety precautions are taken. It is based upon the reaction of silicates
with hydrofluoric acid. There is an effervescence, after carbonate minerals have been
excluded by a test using hydrochloric acid. The issue is safety. Neither silicon
tetrafluoride, nor hydrofluoric acid are substances to be handled without rather
careful safety precautions. Obviously you cannot even use "standard" glassware to
carry out the test because the glass will evolve the same toxic nasty reaction
products. SiF4 reacts with water vapor to produce more HF and HF is just one of
those substances you do not want to "mess with" unless you really know what you
are doing.

vignesh the cooler version of newton

Blazing goIITian

Joined: 16 Mar 2008

Posts: 1801

23 Oct 2008 19:30:29 IST

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can anyone plzz gimme somethng more..
i dont think the lab will have any of the fluride salt..

Madmax

Blazing goIITian

Joined: 24 Dec 2007

Posts: 1111

23 Oct 2008 21:25:41 IST

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No. 1 : I dunno if silicates will be provided...atleast among the many anions we've tested, I've never come across a silicate

No.2: If they do then the cpd will almost definitely by talc (mg Silicate as U mentioned) ( Ya, its the same thing used in talcum powder)

No.3: I'm looking for tests, but din't find any direct ones

Here's one from Wikipedia.....It involves creation of Silane (SiH4), the silicon equivalent of CH4

Silane can be produced (temporarily) by heating the silica cpd with magnesium powder, then pouring the mixture into a 20% dilutionof hydrochloric acid. The magnesium silicide reacts with the acid to produce silane gas, which combusts on contact with air and produces tiny explosions. Also Silane has a repulsive smell.....this can be used

See, the thing is tht this is something I just thought of, so I dunno if this is practically possible in the lab environment (atleast at the high school level) :)

BTW:here's the link to Archith05's answer :www.newton.dep.anl.gov/askasci/chem03/chem03124.htm (Give the credit to the real authors dued!!)

Do reply or nudge for more

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cheers!!

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