MS_2.2_TPDE

Mapping the phase diagram of a three-liquid mixture with the help of a solvatochromic fluorescent dye.

Task symmetry

1. Construct Binodal curve
2. Trace tie-lines

File list

1. curve_fit_tie_line.ipynb Save the spectrum (.csv) to 'curve_fit_tie_line/' and run the jupyter notebook Plot the spectrum curve and find wavelength for upper and lower layer of the 3 mixtures

2. curve_fit_binodal.ipynb Save the spectrum (.csv) to 'curve_fit_binodal/' and run the jupyter notebook Plot the spectrum curve and find wavelength for all 4 mixtures

3. Tabulation_for_experiment_data_Workbook.ipynb Calculate the mass fraction with the volumes as the input.

4. Ternary_Phase_Diagram.csv Save all the mass fraction values

Colour	Corresponding String
black	'Binodal'
red	'Tie Line 1'
blue	'Tie Line 2'

Experimental Procedure

Step 1- Set up burettes with solvents

Step 2- Dispense the solution mixture for tie line into sep. funnels:

V_water/ml	V_toluene/ml	V_ethanol/ml
8.0	5.3	9.4
6.0	4.6	12.7
3.0	10.15	10.4

Shake for 5 min and set aside for later measurement

Step 3- Dispense the solution mixture for binodal into conical flasks (2 ppl):

V_water/ml	V_toluene/ml	V_ethanol/ml
4.0	25.4	upon adding
10.0	11.5	upon adding
10.5	4.9	upon adding
16.5	1.0	upon adding

Record vol. of ethanol added from burette

Step 4- Determine int time & scans to ave (1 ppl):

V_water/ml	V_toluene/ml	V_ethanol/ml
2	0	0
0	2	0
0	0	2

Add 2 μL prodan Change int time till signal saturation (not background subtracted) & record int time Use lowest int time of the 3 pure solvents

Step 5- Measure prodan spectra, pure solv

Step 6- Test binodal solns, plot & analyse on ternary plot

Step 7- Test tie line solns, plot & analyse on ternary plot

Other parameters for control

Intergration time/ms	Scans to average
?	10