Complete as directed below and in the attached document.
In this experiment, the non-volatile solid solute is Biphenyl and Solvent is cyclohexane. You have to confirm the molar mass of the solute, using the colligative property of depression of freezing point.
DATA COLLECTION AND DATA ANALYSIS:
Print out report sheet to conduct data analysis.
The experiment has been conducted for you and you are given the data and example graphs.
There are 3 Runs:
Run 1 – pure solvent cyclohexane
Run 2 – cyclohexane with 0.2198g of Biphenyl solute
Run 3 – cyclohexane with 0.2033g Biphenyl solute
The data sets and the example graphs can be seen in the excel sheet below. You will be adding your graphs to this file.
Molar Mass Data Set Excel sheetPreview the document
Keep the Molar mass Data set excel sheet open in front of you. Breakdown of excel sheet:
Sheet 1 is an example for data set and has graphs for both run 1 in blue (pure solvent cyclohexane) and run 2 in red (of solution -cyclohexane with 0.2198g Biphenyl – You can see the depression in freezing point in solution compared to that of pure solvent.
Sheet 2 has the graph for run 1 only
Sheet 3 has graph for run 2 , and also shows the lines of extrapolation used to find the freezing points
Sheet 4 – has the data set for the students. It has Run 1 (same as sheet 1 and 2) as well as run 3 (Cyclohexane with 0.2033g Biphenyl – Note that Run 3 has different amount of solute than in Run 2.
What you are expected to do:
Create Sheet 4. Plot the graph of Run 1 and Run 3 on Sheet 4 using Sheet 1 as an example. Both graphs should be on the same scale.
Create sheet 5. Using the same scale as in previous graphs, plot a graph for Run 3 only. Pay attention to how Run 2’s plot was constructed for the best fit lines to be drawn. Watch the video below.
Alternative to sheet 5 and extrapolating on excel – you are welcome to print out the graph from sheet 4 that was plotted with run 1 and 3, and draw the extrapolated line using ruler and pencil
Complete the report sheet using the data of the freezing point temperature of Run 1 and Run 3 – under the data from extrapolation of graph.
Use the data to complete the analysis to find the molar mass of the solid. YOU MUST SHOW COMPLETE CALCULATIONS, EQUATIONS AND CONVERSION FACTORS
Complete postlab question 1
Scan the report sheet, the graphs from sheet 4 and name them appropriately.
Your Lab 4 Report should have purpose, well labeled graphs, Report sheet showing all data and calculations and Result.
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