Procedure B. Det A. Calibration of Thermometer with Pure tert-Butanol The solvent for this experiment will be tert-butanol. Since you do not have a calibrated thermometer or carefully purified tert-butanol, your measurement of tert-butanol\'s freezin probably not agree with the literature value shown in Table 1 above. However, you are optt in temperature changes. Therefore, the first step will be to determine the freezing point of with your equipment neare Reco t of the solven C. D Fll a -in test tube about half full with tert-butanol. Keep this test tube in a beaker of water at 30-35 °C until ready to use so that the alcohol does no app test solidify. Do not overheat as this will cause substantial evaporation. sol -Thermometer Wire Stirrer-> -Water ( Bath (20, Figure 2 as shown in Figure 2. The water bath should be about 5 degrees below the Set up the apparatus expected freezing point. A second thermometer can be used to monitor the bath necessary, to adjust the bath temperature. Avoid extremely cold water as this amount of supercooling. Immerse the test tube in the water bath and stir crystalization (the solution begipe t apgear opaque), read the tem (Try to estimate to the nearest\'o.1 \"c) This may be your freezang point. Continue the thermometer. If the temperature rises, your solution has experienced som temperature. Use ice, if would cause a large constantly, At the first sign of temperature as precisely as possible temperature stops rising, this will be your best freezing point. atching Melt the sample in a beaker of warm water and repeat the determination. the 202
1.As the colligative properties depends on number of solute particles so that means it depends on concentration.so any loss from solution will have an effect on the concentration.thats why it will affect experimental results also.
2(a).As chnge in temperature or freezing point depression is directly related to molecular weight of solute so evaporation chnges the temperature so will affect molecular weight.
b.There will not be any affect on molecular weight if thermometer reads 1 degree celsius too low because it depends only on chnge in frezzing temperature.
c.If some part of unknown solute fails to dissolve it will not affect the molecular weight as it will only lead to supercooling else all properties are same.
d.If solute get dimerized the solution will behave as if it had half the particles dissolved in it.so it would give les moles so some mass divided by less moles will give high molecular weight.
3.impuurities will furthur lower the freezing point thus affecting the molecular weight.
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