melt and observe decolorization, but miss the melting point. Should you cool the

Question

melt and observe decolorization, but miss the melting point. Should you cool the sample and re-melt it, or start over?. Explain you answer. 5. You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112 C Explain how you can get two different values with exactly the same sample. Describe the procedure for conducting a melting point experiment. Include the names of the equipment used and the observations you could expect to make. 6.

Explanation / Answer

Answer 4: In this case the compound is melted to observe the change in color and the change in color occurs because of being decomposed or undergoing any chemical reaction. In either case the chemical composition of original compound changes. Thus, cooling the compound and re-melting would alter the melting point and it would not give the same melting point as the crystal structure would have changed. So, ideally a fresh sample has to be melted to determine the melting point.

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