[CHM 112] Make Sure your Borfax Lab Calculations are Correct!

[Andrew J. Pounds]

Let's make sure that we get this right.  It will really help if you look 
at the first page of the lab procedures when going through this. For 
each of the B4O5(OH)_4 2− you need to use 2 H+.   So the concentration 
of the B4O5(OH)42− is going to be 1/2 the moles of acid used in the 
titration divided by the original volume you collected in the test tube 
(5 ml) Now, 
theKsp=[Na+]2[B4O5(OH)42−]=(2x)2xK_{\mathrm{sp}}=\mathrm{[Na^+]^2 
[B_4O_5(OH)_4^{2-}]}=(2x)^2 x The concentration of the B4O5(OH)42− is 
going to be "x" and the concentration of the Na+ is going to be "2x", 
and the value of Ksp\mathrm{K_{sp}}is going to be "4x^3". Got it? When 
you prepare your plot of lnK vs 1/T, be sure to use KELVIN for the 
temperature.  Use 8.314 for R (with its correct units) when calculating 
the enthalpy and entropy for the reaction.



-- 
*/Andrew J. Pounds, Ph.D./*
/Professor of Chemistry and Computer Science/
/Director of the Computational Science Program/
/Mercer University/
/1501 Mercer University Drive, Macon, GA 31207 /
/(478) 301-5627/
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