In the essay lab report you will write a background explaining how the experiment is related to liquids and solids. The purpose area you will talk about the goal of this experiment.In the procedure area you will write down the several experiments that were conducted along with this lab report. I have written the procedure of the lab experiments that were conducted: Boiling point Part 1 make a test tube assembly by using the following directions.
A. place about 1ml of isopropyl alcohol in a test tube.
B. using a small rubber band, attach a thermometer to the outside of the test tube. The thermometer bulb should be even with the test tube’s bottom.
C. insert an inverted closed end capillary tube into the test tube
Part II make a water bath assembly
A. half fill a 100ml beaker with warm tap water
B. place the above test tube assembly in the water bath so that the surface level of the alcohol in the test tube is beneath the surface level of the water bath.
C. set up the burner stand and place the beaker on top. Light the burner fuel and slip it under the beaker while gently stirring frequently to ensure even heating carefully heat the water bath until it boils and a rapid stream of bubbles continuously emerges from the capillary tube.
E. when the last bubble emerges from the capillary tube, record the temperature.
F. reheat the water bath and repeat the cooling process two more times. Record the temperature reading after each trail and average all three trials.
G. the published boiling point of isopropyl alcohol is 82,4 degree celcius. Calculate the error between the observed boiling point and the published value of the boiling point.
2. Melting point
A. with gloved hands insert powdered acetamide into the open end of the second capillary tube by gently pushing and tapping tube into powder.
B. move the powder toward the closed end of the capillary tube by gently tapping the closed end onto a table. Repeat until the powdered acetamide has moved at least three quarters of the way toward the closed end and occupies 1-2 mm of the capillary tube end.
C. with a rubber band carefully attach the filled capillary tube to a thermometer and align the bulb of the thermometer with the closed end of the capillary tube.
D. make a water bath as before by half filling a 100ml beaker with warm tap water and heating it on the burner stand with the burner fuel.
E. place the thermometer capillary tube assembly in the water bath so that the surface level of the powdered acetamide is beneath the surface level of the water bath.
F. place the beaker on the wire stand and stirring frequently to ensure even heating carefully heat the water bath while observing the acetamide powder.
G. Note the temperature at whic the acetamide melts and immediately extinguish the burner flame as directed above.
H. let the acetamide cool and recrystallize. Record the temperature and then repeat the procedure two more times and average the results.
I. the published melting point of acetamide is 81 degrees celcius. Compare your experimental result with the accepted (published value)
J. calculate the percent error.
Questions:
A. why is it useful to know the melting point and or boiling point of a substance?
B. how would you determine the melting of a substance whose melting point is higher than 100 degree celcius?
C. what would be the effect of increasing the amount of crystals in the capillary tube?
D. List sources of error and explain how they would affect your end results?
Lastly include a conclusion within lab report.
Last Completed Projects
| topic title | academic level | Writer | delivered |
|---|