Question

The following data have been obtained for the effect of solvent composition on the solubility of serine, an amino acid, at 10.0 ^oC.

Volume % Methanol	0	10	20	30	40	60	80	100
Solubility (g/100 mL solvent)	22.72	18.98	11.58	6.415	4.205	1.805	0.85	0.65
Solution Density (g/mL)	1.00	0.98	0.97	0.95	0.94	0.91	0.88	0.79

The data were obtained by mixing known volumes of methanol and water to obtain the desired solvent compositions, and then slowly adding measured amounts of serine to each mixture until no more would go into solution. The temperature was help constant as 10.0^oC.

1. Derive an expression for mass fraction of methanol in solvent, x, as a function of volume fraction of methanol in solvent, f.
2. Prepare a spreadsheet of solubility of serine (g serine/g solution) versus mass fraction of methanol

Assume the density of water and methanol are 1 g/mL and 0.792 g/mL, respectively. Also, assume the "100 mL solvent" in the units of solubility shown in the second row of the table is the final volume of solvent after mixing the water and methanol.

******* once you plot it correctly, youre apparently suppose to get the equation y=.9956x-.0296..... i keep getting y= -.21x+.1707*******

Answer 1