Describe an alternative method for evaporation of the CH2Cl2 Can be steamed and then rinsed with ethyl acetate for several hours, and then rinsed with water, or can be soaked in a bath of CO2 and run through water, making carboxylic acid. (2) Caffeine: (4)
Repeated exposure can produce general deterioration of health by an accumulation in one or many human organs. First Aid Measures:
Eye contact – Immediately flush eyes with plenty of water for at least 15 minutes. Cold water may be used. WARM water MUST be used. Get medical attention. Skin Contact – Immediately flush skin with plenty of water. Cover the irritated skin with an emollient. Remove contaminated clothing and shoes. Wash clothing before reuse. Thoroughly clean shoes before reuse. Get medical attention. Serious Skin Contact – Wash with a disinfectant soap and cover the contaminated skin with an anti-bacterial cream. Seek immediate medical attention.
Inhalation – remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical attention. Serious Inhalation – Evacuate the victim to a safe area as soon as possible. Loosen tight clothing such as a collar, tie, belt or waistband. Seek medical attention. Ingestion – do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person. Loosen tight clothing such as a collar, tie, belt or waistband. Get medical attention immediately. Dichloromethane: (5)
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Causes eye and skin irritation, respiratory tract irritation. Harmful if swallowed and possibly if inhaled. May cause central nervous system effects, and kidney damage. First Aid measure: Eyes – immediately flush eyes with plenty of water for at least 15 minutes. Get medical aid. Skin – flush skin with plenty of water. Remove contaminated clothing and shoes. Get medical aid if irritation develops and persists. Wash clothing before reuse. Ingestion – If swallowed, do not induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious person. Get medical aid. Inhalation – remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. 6. A rotary evaporator (rotovap) is typically used in chemistry for the removal of solvent from samples by the process of evaporation. Can also be used in molecular cooking for the preparation of distillates and extracts.
How the rotovap works, is it increases the rate of evaporation of the solvent by reducing the pressure to lower the boiling point of the solvent, rotating the sample to increase the effective surface area and heating the solution. (6) When performing a liquid-liquid extraction, the separatory funnel should be (c) 3/4 full. List two things you should do before pouring liquid into a separatory funnel: be sure the stopcock is in the closed position be sure the stopcock is sideways tight. Dichloromethane will be the bottom layer, since it has a higher density than the aqueous solution. The stopper must be removed from the sep funnel when liquid is being drained from it through the stopcock, so that air can flow in through the top while the liquid is flowing out the bottom.
1. Chem Spider. 2011. Caffeine. [ONLINE] Available at: //www.chemspider.com/Chemical-Structure.2424.html. [Accessed 07 October 14]. 2. Beverage Answers. 2014. Decaffienated Tea – How is Decaf Tea Made. [ONLINE] Available at: //www.beverageanswers.com/tea/decaf-tea.html. [Accessed 07 October 14]. 3. The Modern Embalmer. 2012. CALL OF THE WILD: TAXIDERMY TANNIC ACID/TANNINS IN EMBALMING. A DEAD-END ROAD TO FORMALDEHYDE-FREE CHEMICALS.. [ONLINE] Available at: //www.themodernembalmer.com/tannin.html. [Accessed 07 October 14]. 4. Science Lab. 2013. Material Safety Data Sheet Caffeine MSDS. [ONLINE] Available at: //www.sciencelab.com/msds.php?msdsId=9927475. [Accessed 07 October 14]. 5.Science Lab. 2013. Material Safety Data Sheet Dichloromethane MSDS. [ONLINE] Available at: //wcam.engr.wisc.edu/Public/Safety/MSDS/Dichloromethane.pdf. [Accessed 07 October 14]. 6. Chem.UCalgary. 2014. Organic Laboratory Techniques. [ONLINE] Available at: //www.chem.ucalgary.ca/courses/351/laboratory/rotavap.pdf. [Accessed 07 October 14].
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