EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
6th Edition
ISBN: 9781305687875
Author: Gilbert
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Question
Chapter 3.3, Problem 1E
a)
Interpretation Introduction
Interpretation:Errors in procedure that cause observed melting point of pure compound to be lower than correct melting point should be determined.
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
b)
Interpretation Introduction
Interpretation:Errors in procedure that cause observed melting point of pure compound to be higher than correct melting point should be determined.
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
c)
Interpretation Introduction
Interpretation:Errors in procedure that cause observed melting point of pure compound to be broad in range than correct melting point should be determined.
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
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1. Total Milk solids = 12.2% H20 = 87.8%
Milk standardized solids = 8.8% Butterfat
solids = 3.4% solids
a. Find out what the freezing point is for the
milk.
b. If you cool the milk slowly to -5 C°, describe
what phases form in your milk bottle.
c. Calculate the relative fraction of the phases
in (b).
Brian forgot to close the end of his capillary tube when he was conducting the boiling point determination experiment. He then decided to use a lighter to close the end, making sure that it does not touch the oil. Which of the following statements is true?
a. Brian did a great job in making sure that the experiment worked. It is important to close the end of the capillary tube for accurate determination of the lower limit of the sample's boiling point.
b. What Brian did is dangerous as oil is a flammable substance. He should have stopped the experiment then closed the tube first before continuing.
c. It is not important to close the end of the tube. He could have just proceeded with the experiment or covered the end of the tube with tape since prolonged air contact might contaminate the sample.
d. Brian could have covered the end of the capillary tube with his finger, since it is not as dangerous as using the lighter on a flammable substance such as oil.…
Chemistry
5. You melt the substance and de-coloration occurs. Unfortunately, you weren’t paying attention and miss the melting point. Should you start over or re-melt it? Or both are options ‘okay’?
6. When measuring the melting point of a substance, it suddenly disappears. What has happened? Can you still measure the melting point? If so, how?
7. We should not re-use a sample in a capillary tube for melting point measurement. Why not?
8. It takes significant amount of time for the melting point apparatus to cool down before next measurement if your new sample has a lower melting point than your previous one. What can you do to reduce this time in between measurements when many samples of different melting points are used?
Chapter 3 Solutions
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
Ch. 3.2 - Prob. 1ECh. 3.2 - Prob. 2ECh. 3.2 - Prob. 3ECh. 3.2 - Prob. 4ECh. 3.2 - Prob. 5ECh. 3.2 - Prob. 6ECh. 3.2 - Prob. 7ECh. 3.2 - Prob. 8ECh. 3.2 - Prob. 9ECh. 3.2 - Prob. 10E
Ch. 3.2 - Prob. 11ECh. 3.2 - Prob. 12ECh. 3.2 - Prob. 13ECh. 3.2 - Prob. 14ECh. 3.2 - Prob. 15ECh. 3.2 - Prob. 16ECh. 3.2 - Prob. 17ECh. 3.2 - Prob. 18ECh. 3.2 - Prob. 19ECh. 3.2 - Prob. 20ECh. 3.2 - Prob. 21ECh. 3.2 - Prob. 22ECh. 3.2 - Prob. 23ECh. 3.2 - Prob. 24ECh. 3.2 - Prob. 25ECh. 3.2 - Prob. 26ECh. 3.2 - Prob. 27ECh. 3.2 - Prob. 28ECh. 3.2 - Prob. 29ECh. 3.2 - Prob. 30ECh. 3.2 - Prob. 31ECh. 3.2 - Prob. 32ECh. 3.2 - Prob. 34ECh. 3.3 - Prob. 1ECh. 3.3 - Prob. 2ECh. 3.3 - Prob. 3ECh. 3.3 - Prob. 4ECh. 3.3 - Prob. 5ECh. 3.3 - Prob. 6ECh. 3.3 - Prob. 7ECh. 3.3 - Prob. 8ECh. 3.3 - Prob. 10ECh. 3.3 - Prob. 11ECh. 3.3 - Prob. 12ECh. 3.3 - Prob. 13ECh. 3.3 - Prob. 14ECh. 3.3 - Prob. 15ECh. 3.3 - Prob. 16ECh. 3.3 - Prob. 17ECh. 3.3 - Prob. 18ECh. 3.3 - Prob. 19ECh. 3.3 - Prob. 21ECh. 3.3 - Prob. 22ECh. 3.3 - Prob. 23ECh. 3.3 - Prob. 24ECh. 3.3 - Prob. 25ECh. 3.3 - Prob. 26E
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