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 H_{4}SiO_{4}(aq) = 1.5*10^-6 mol/L

How would I go about finding saturation with respect to talc which chemical formula is Mg_{3}Si_{4}O_{10}(OH)_{2}?

Thanks again