[CHM 112] Help with the Solubility of Borax lab

[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 \documentclass{article} \usepackage[utf8x]{inputenc}
\usepackage[version=3]{mhchem} \pagestyle{empty} \begin{document}
\ce{B_4O_5(OH)4$^{2-}} \end{document} you need to use 2 H+.   So the
concentration of the \documentclass{article}
\usepackage[utf8x]{inputenc} \usepackage[version=3]{mhchem}
\pagestyle{empty} \begin{document} \ce{B_4O_5(OH)4$^{2-}} \end{document}
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, the $K_{\mathrm{sp}}$ expression is

$K_{\mathrm{sp}}=\mathrm{[Na^+]^2 [B_4O_5(OH)_4^{2-}]}=(2x)^2 x$



The concentration of the \documentclass{article}
\usepackage[utf8x]{inputenc} \usepackage[version=3]{mhchem}
\pagestyle{empty} \begin{document} \ce{B_4O_5(OH)4$^{2-}} \end{document}
is going to be "$x$" and the concentration of the Na+ is going to be $2x$,
and the value of $K_{\mathrm{sp}}$ 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.


This lab report need a cover page, the completed report form, and the
graph ONLY.  There is no need to turn in lab notebook pages for this lab.


This should be turned in when you come to CLASS on Wednesday.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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