The Organic Chem Lab Survival Manual: A Student's Guide to Techniques
The Organic Chem Lab Survival Manual: A Student's Guide to Techniques
10th Edition
ISBN: 9781118875780
Author: James W. Zubrick
Publisher: WILEY
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Chapter 12, Problem 1E
Interpretation Introduction

Interpretation:

If someone has put about one-quarter of an inch of solid in the tube, should they go for an eye exam is to be explained.

Concept Introduction:

The melting point of a substance is the temperature at which it changes state from solid to liquid. This change occurs in atmospheric pressure and during melting point the two phases (solid and liquid) exist in equilibrium.

Nowadays in laboratory lots of equipment is available for determine the melting point of substance.

Put the correct amount of a solid in a melting-point tube.

Expert Solution & Answer
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Answer to Problem 1E

The person should carefully put the correct amount of sample in the tube.

Yes the person should go for an eye exam, if someone has put about one-quarter of an inch of solid in the tube due to weak eyesight.

Explanation of Solution

A melting point is the temperature at which the first crystal just starts to melt until the temperature at which the last crystal just disappears. Take melting points only on dry, solid substances, never on liquids or solutions of solids in liquids or on wet or even damp solids.

Use only the smallest amount that you can see melt because larger samples will heat unevenly. The person should carefully put the correct amount of sample in the tube.

Yes the person should go for an eye exam, if he/she has put about one-quarter of an inch of solid in the tube due to weak eyesight.

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Students have asked these similar questions
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?
In getting/testing the surface tension of a liquid, what is the importance of collecting more than one drop of the liquid sample from the burette?
Heating of the oil bath must done slowly to get a more accurate reading of the melting point of a sample. Why must this be done slowly?

Chapter 12 Solutions

The Organic Chem Lab Survival Manual: A Student's Guide to Techniques

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