[유기화학실험][프리랩+결과]determination of melting point&TLC(thin-layer chromatography)
- 최초 등록일
- 2015.03.24
- 최종 저작일
- 2015.03
- 3페이지/ MS 워드
- 가격 1,000원
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본문내용
It means that a minute change in temperature causes a change in the state of a solid in a liquid or in the state of a liquid in a solid.
- The melting range is temperature range up to the point from where any compound starts to melt to where it melt completely.
2) Measure melting point of pure compound and mixture.
- For many pure compounds the range of temperature change, or melting range, over which this breakdown occurs will be from 0.5℃ to 2℃. So, the melting range is sometimes taken as circumstantial evidence of purity.
- Because heat is transferred and spread requires the time, heating rate should slow down in order to get clear melting point.
- Melting point varies depending on the purity of the sample. If the sample has impurities, the melting point of the sample represents a wide range of temperatures and lowers the melting point. Lowering the amount will depend on the amount of impurities contained in the compound and melting point of the compound mixture can be seen by examining the temperature-composition phase diagram.
참고 자료
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