This experiment is to provide students with learning experience related to organic synthesis.  In particular, students will learn a number of practical skills: heating under reflux, suction filtration and re-crystallisation.  In addition, students have to handle quantitative problems: determining the percentage yield and the limiting reagent of a reaction.  This experiment can be completed in two 40-minute lessons.  The amounts of chemicals required are small. 

Please see the draft documents, in English and Chinese, for details.  Click here to download (updated on 6 Nov 09).

Acknowledgment :

• Dr LL YEUNG and Dr Dennis CHAN, University of Science and Technology
• Ms SC CHU and her team, Hong Kong True Light Middle School
• Ms Anita LEUNG and her team, Ho Fung College (Sponsored by Sik Sik Yuen)
• Mr WC LO and his team, S.K.H. Li Ping Secondary School

資料來源：

學校／幼稚園／幼稚園暨幼兒中心／幼兒中心預防傳染病指引 (2009年6月)：

http://www.chp.gov.hk/files/pdf/School_full_tc_20090115.pdf

潔手小冊子(2009年6月)： 

http://www.chp.gov.hk/files/her/hw_2587_010_en.pdf 

請看以下影片，再選出哪個是最省力的方法？

Infrared spectroscopy: solid sample prep (6:28")

Infrared spectroscopy: liquid sample prep (2:25")



Operation of an IR spectrometer (1:35")

 

Melting Point Determination (4:07")

 

Reactivity of haloalkane (7:02")

Thin Layer Chromatography (3:35")

Source: produced by Dept of Chem, UST with the support of QEF

The use of online CAL in the learning or revision is suitable for the students’ self learning in this era. This great site by Darrell J. Woodman, Professor of Department of Chemistry, University of Washington is suitable for assigning task for student self learing or revision of orgainc chemistry.

http://depts.washington.edu/woodmand/webExHome.html

It contain a lot of activities like,

• Interactive Exercises
• Nomenclature Study Aids
• Reaction Mechanism Practice
• Reagents/Reaction Patterns Drill

示範如何提取有用的物質
Demonstrate how to extract useful substance

Video Clip

Content:
Using a mortar and pestle to grind solid into powder; folding a fluted filter paper; dissolving the aspirin powder; filter a hot and saturated solutions; crystallization; carrying out suction filtration; taking solid out from the Buchner funnel; preparing a melting point tube; introducing solid into a melting point tube; using a melting point apparatus to determine the m.p. of a purified solid.

使用快接儀器方法錄影片段
How to use quickfit apparatus

Video clip

Content:
Sealing a quickfit joint by lubricant; equipment for distillation; assembling the quickfit; Transferring chemicals to reaction flask; placing thermometer bulb in the correct position; setting up a water condenser; using a T-shape adapter; adding anti-bumping granules before heating; adjusting the rate of heating; other methods of heating; dismantling quickfit apparatus.

 http://resources.edb.gov.hk/~science/naming/intro.htm