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Topic: saturation problem  (Read 2436 times)

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sickness

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saturation problem
« on: April 19, 2005, 01:24:03 AM »
I am on the 3rd step of a 4 step probelm.  The first 2 were pretty easy writing and equation and  calculating K.
 but I want to make sure I am doin gthis right starting with delta G
(4*-237.14+4*-1307.9+3*.455.4)-(-5527.1) = -2019.26 Kj/mol
 from there I calculated K using e^-dG/RT
T = 37C or 310.15K
R = 8-.31

dG/RT = .783465
e^.783465 = 2.18904
This doesn't seem right for K but my prof likes giving us jacked up problems to make us think it is worng but can anyone find error thus far?

My main question however is saturation.  It gives us PH=4 Mg+3 = 8.7*10^-4 mol/L and H4SiO4(aq) = 1.5*10^-6 mol/L
How would I go about finding saturation with respect to talc which chemical formula is Mg3Si4O10(OH)2?

Thanks again

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