Graphical Analysis of Data Use Excel to create three separate graphs of Temperat
ID: 1066398 • Letter: G
Question
Graphical Analysis of Data Use Excel to create three separate graphs of Temperature versus Time" for the pure solvent and the two solutions studied. Each graph should have an appropriate title and labeled axes with an appropriate scale. Add two trendlines to the data points of each graph. You can do this by hand with a ruler or by using Excel. The first line is applied to data points that correspond to the cooling of the liquid state these are the points on the steep part of the graph. The second line is applied to data points that correspond to the co-existence of both the solid and liquid (freezing) these are the points on the part of the graph where the temperature levels out. Extrapolate the two trendlines towards each other until they intersect. The temperature at the point of intersection is the solvent freezing point and should be clearly shown on each graph. Attach your three graphs to this report. Record the freezing point temperatures obtained from the graphs below. Solution I 41 Solution II 44 Pure PDB. Calculation of Molar Mass Complete the table below with the results of your calculations. Be sure to include all units. Note that K, PDB 7.10 oC-kg mor Solution I Solution II 1. Mass of PDB added o 6574 Kg 2. Total mass of unknown added A.07 3. Freezing point of pure PDB 4. Freezing point of solution LI4 5. Total Freezing point depression, AT 6. Molality of solution 7. Moles of unknown in solution 8. Molar Mass of unknown 015 13d .667 79 IS Unknown number has an average molar mass of lob g/mol.Explanation / Answer
1. Freezing point of PDB = 53.09C
Reference source data: Lide, D.R., CRC Handbook of Chemistry and Physics 86th. edition, 2005-2006
https://pubchem.ncbi.nlm.nih.gov/compound/1_4-dichlorobenzene#section=Melting-Point
2. Theoretical value of freezing point of PDB = 53.09C
Experimentally determined value = 51C
Percentage error = (theoretical value – experimental value)/(theoretical value)*100 = (53.09C - 51C)/(53.09C)*100 = 3.9367 3.94 (ans).
3. The experimentally observed molar mass of PDB is found to be thrice as large as the theoretical value. This can indicate that the solute weighed out is contaminated with impurities which register a higher value for the mass of the solute dissolved. Another possibility, though rare, is that PDB undergoes some kind of association in the solid state whereby three molecules of PDB are associated to form a trimer. This possibility, however is rare since PDB would show no propensity to form hydrogen bonds.
An exact evaluation of the experimental procedure is needed to answer the last question completely, so kindly upload the experimental procedure
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