Lab Report Boiling Point and Melting Point Essay

2350 Words Jul 30th, 2013 10 Pages
repCHEMISTRY I - LABORATORY EXERCISE MANUAL
LABORATORY EXERCISE 10: Melting Point and Boiling Point Determination
This is a traditional lab. You'll simply follow the step-by-step procedure, keeping records of your measurements and observations. Each student will write their own lab report, which should include the following:

Name:

Names of lab partners:

Date of Experiment:

Date Report Submitted

TITLE:

Purpose: A brief statement about what the experiment is designed to determine or demonstrate about chemistry

Procedure: Brief summary

Data Tables:

Observations:

Conclusions: What did you learn from the experiment? Should be based on observations made during the experiment.

Evaluation of laboratory exercise
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j. Calculate the percent error.
Clean-up:
Dispose of the used capillary tubes by putting them in your trash can. If any isopropyl alcohol is left in your test tube, you may pour it down the drain with water.

All contents copyrighted (c) 1998
Peter Jeschofnig, Ph.D., Professor of Science, Colorado Mountain College
All Rights reserved
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Experemint 10 As described in the lab manual: 1. Record the barometric pressure. 2. Measure about 10 g of ice using the chemical balance and place it into a 100 mL beaker. Heat over a flame until half of the ice has melted. Remove from heat and measure the temperature as accurately as possible using your laboritory thermometer. Repeat with a 10.0 g sample of your unknown. Be sure to record your unknown number. 3. Measure 50 mL of water using your graduated cylindar and pour it into a 200 mL beaker. Bring the liquid to a boil over a flame. After the liquid has been boiling for approximately 1-2 minutes, measure the temperature of the boiling liquid. Repeat with a 10 g sample of your unknown. Record all data in your lab notebook and clean up.
We followed all the steps above pretty much closely and pretty much got the results for water that we expected, except that the stockroom had cheap thermometers because one of them broke (this was my lab partner’s fault – she used it as a stirring rod which is exactly what you said not to do in your lecture) and the new one was off by a few degrees – but

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