through Physical Manipulation Date Lab Performed: Nov. 11/2013 Date Lab Submitted: Nov. 18/2013 Introduction We conducted this experiment to investigate the technique of liquid / liquid extraction‚ the miscibility of organics and water and the effect of a mixture of compounds in methylene chloride versus pure compounds retention time as introduced to a Gas chromatograph. From this information‚ the identity of the compounds can be determined
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as the food of the fungus. Gloves‚ face masks and lab gown were also needed for laboratory safety rules. Preparation of Different Concentrations and Treatments Fresh Duranta leaves were collected for extraction. Leaves of Duranta were washed with running tap water before extraction process. The leaves were soaked in ethanol for 48 hours. The different treatments were prepared and were diluted to each level of concentration. For the 100% concentration‚ it has a full 5 ml application. In 75%
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TEACHER’S GUIDE CHEMISTRY TOPIC: OBSERVATIONS AND EXPERIMENTS USEFUL TIPS: Student’s experiments can be done in groups. Groups can be given different mixtures. Each group then carry out their own experiment‚ makes a write up of their procedure and presents to the rest of the class together with the samples obtained. UNIT 1: MIXTURES AND PURE SUBSTANCES This unit is suitable for senior one (S1) BRIEF DESCRIPTION OF THE UNIT: This unit deals with: • Methods of separating
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income for local communities but also affecting the desert ecosystem by depleting water and nutrient supply. Deserts in the US‚ Middle East and South America all have increasing human activity in their deserts. In the Atacama Desert in Chile‚ the extraction of sodium nitrate has been a common practice from 1850. Over 170 mining towns such as Humberstone and Santa Laura sprang up throughout the desert. The Salar de Atacama is Chile’s largest salt lake and has been mined extensively by companies such
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nutmeg by extraction‚ and then used to prepare myristic acid by hydrolysis. The isolation of a substance from a natural product is a common technique used nowadays. Usually‚ the isolation is a complex procedure and requires a lot of steps and preparation. For this experiment‚ trimyristin will be isolated from nutmeg‚ in which it is present in large amounts; therefore the isolation is not as complex. The process that will be used to isolate trimyristin from the nutmeg is called extraction. It involves
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Extraction and analysis of two compounds from unknown solution C ABSTRACT Liquid C and solid C were both extracted from unknown solution by first using chemically active liquid-liquid extract‚ followed by vacuum filtration. Liquid C and solid C were then purified with the use of simple distillation and recrystallization respectively. Through the process of recrystallization‚ the percentage purity of solid C was found to be 6.01%. The melting point range of purified solid C was 117.0 – 119
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comparison between the two approaches. Because ionic liquids have a negligible vapor pressure‚ evaporating the extracted hydrocarbons from the ionic liquid phase could achieve the recovery of the ionic liquid. Preliminary calculations show that extraction will be better with ionic liquids compared to using sulfolane as the solvent. المستخلص : في هذا العمل ناقشنا تطبيقات السوائل الأيونية ، النظرة التاريخية، و بالتفاصيل دورها في معالجة النافثا بتجربة معملية للطرق المطبقة حاليا و أخرى بهذه
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ether 5ml extraction solvent 20ml 10% aqueous solution and 20ml of saturated sodium chloride Procedure PEPARING CHROMATOGRAPHY COLUMN Pack a column for chromatography- ref. OP-21a clamp column to ring stand over 25ml beaker close column with cork or rubber stopper EXTRACTING PIGMENTS use OP-18c to extract the solid material from the tomato paste extract 3 times w/ successive 10-ml portions of 50% mixture each time extract through filter paper into small flask After 3rd extraction‚ transfer
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Introduction: The purpose is to isolate caffeine from coffee by using the organic solvent dichloromethane (CH2Cl2) that is also referred to as direct contact. Calcium carbonate (CaCO3) is used to remove the tannins from the coffee. Afterwards an extraction is used to separate the organic layer (bottom) from the aqueous layer (upper). By using a rotary evaporator‚ it evaporates the organic solvent and forms the crude caffeine. Afterwards we used acetone-petroleum ether for recrystallization and the
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distilled water and 5 mL of dichloromethane through the column and making the column much more easier to work with and allows for faster and better extractions when adding the tea solution. Load is the next step by beginning to add the caffeinated tea solution and slowly vacuuming‚ where the column will start to change to a brownish color and slow down the extraction just by a bit. Once the caffeinated tea solution has been extracted and the caffeine and other impurities remain in the brownish-colored column
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