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Isotherm Calculations

These data make sense; add more carbon to adsorb more dye and less
is left in solution. We know the starting concentration of dye (1.768 from
the assay that is not exactly the same as what was weighed out or 1.772,
that is why we need controls). This is 1.768 g/L, but we had 100 ml. Thus
0.1768 g was added to each flask. Subtracting what was found at the end
of the run from the amount at the start tells how much was adsorbed. This
is divided by the grams of carbon to get the loading in grams of dye adsorbed
per gram of carbon. Our calculations give this table:
Flask # Grams of Carbon Concentration of Dye Loading on Carbon
1 0 1.768 g/L 0 g/g
2 0.58 1.416 0.0601
3 1.288 1.062 0.0548
4 2.21 0.711 0.0478
5 3.71 0.419 0.0364
6 5.26 0.178 0.0302
7 9.81 0.042 0.0176

In our table we have the loading and the concentration of dye in equilibrium
with that loading. These are the numbers needed to plot the isotherm.
**Graph of Data**

**Home page for adsorption**

**Done**

Last update 10-Jan-95