Abstract: Stevia rebaudiana is an herb with a very high medicinal value. It has more than 100 phytochemicals. It is used as sugar substitute. The extracts from leaves are used for the microbial assay and study the antimicrobial activity. The microbes used for the testing the activities are E.coli‚ Staphylococcus aureus‚ Bacillus subtilis‚ Salmonella typhi‚ Aspergillusniger‚ Candida parapsilosis‚ Trichophyton rubrum. With different concentrations of the extracts starting from 2.5µg/ml‚ 5.0µg/ml‚ 7
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CHM 116 Lab Investigations of Buffers I. Purpose The purpose of this experiment was to get an understanding as to how to properly prepare chemical buffers. Also part of this experiment was to gauge the effectiveness of the buffers by measuring their pH levels in various titration solutions‚ using a pH meter. II. Procedure To start our experiment we had to prepare Buffer B‚ which was the .060 M Ammonia/Ammonium solution. Using 3.0 M ammonia‚ we had to calculate
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Sample | Sucrose | Sodium Acetate | Naphthalene | Mass of solid (g) | 5g | 2g | 2g | Volume of water (50mL) | 50mL | 50mL | 50mL | Volume of water & solid (mL) | 53mL | 52mL |
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4 Environmental record 5 References 6 External links Business segments[edit] Eastman manufactures and markets chemicals‚ fibers and plastics. It provides coatings‚ adhesives and specialty plastics products‚ is a major supplier of cellulose acetate fibers‚ and produces PET polymers for packaging. The company’s products and operations are currently managed and reported in five operating segments: Additives & Functional Products‚ Adhesives & Plasticizers‚ Advanced Materials‚ Fibers‚ and Specialty
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Column and thin layer chromatography of plant pigments CHEMISTRY 201L EXPT 04 PAGE 01 - 12 Noel Angelo P. Kalacas*‚ Hanna Mae Laluces‚ Ina Bianca Lanuza Department of Chemistry‚ College of Science *Corresponding author; e-mail: knight_BeNcH66@yahoo.com Abstract Chromatography is a powerful technique for separating and/or identifying the components in a mixture. There are different types of chromatography and each has its own strengths and weaknesses. In this experiment‚ pigments of the
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water. 4. Preparing ammonium acetate by mixing equal amounts of ammonia and Ethanoic acid being 0.100 moldm-3 . 5. Buffering the pH using ammonium acetate to 4-5 for the greatest EDTA-complex. 6. Dissolving the concentrated deodorant solution (10 ml) in distilled water (90ml) to form a 100 ml deodorant solution. 7. Adding 20 ml of the EDTA solution to the deodorant solution. 8. Stirring the EDTA solution in the deodorant solution. 9. Adding 20 ml of ammonium acetate Ethanoic acid to the deodorant
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are also used in our daily lives. Separation techniques are methods used to separate and/or purify mixtures. There are many kinds of separation techniques that are used in our day to day life‚ such as filtration‚ Centrifuging‚ Decanting‚ fractional distillation and sieving. Each of these methods has their own specific uses in our daily lives which make our chores much easier to carry out. Filtration is one of the most commonly used separation technique in a household. This method uses a funnel
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Cobalt(II) Oxygen adduct complex Inorganic 461 lab 2-29-2012 Abstract This experiment uses Co(salen) as a model compound illustrating the uptake of oxygen in hemoglobin. SalenH2 was prepared as the intermediate‚ and reacted with hydrated cobalt to prepare Co(salen). Using Co(salen) the oxygen up-take was tested. The synthesis of SalenH2 produced 0.65 g. The percent yield of salenH2 was 116% on the filter paper and 105% after transferring salenH2 to a vial. The melting point of salenH2‚ was
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www.igcse.at.ua Hydrocarbon molecules are only made of a chemical combination of carbon and hydrogen atoms. They are compounds because they consist of atoms of atleast two different elements. THE FRACTIONAL DISTILLATION OF CRUDE OIL www.igcse.at.ua Crude oil is a complex mixture of mainly hydrocarbon compound molecules. A mixture consists of two or more elements or compounds which are not
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filtered and recrystallised from ethanol. 4.6.General procedure for Preparation of the N-methylation of piperidin-4-one oximes: The piperidone (0.1mol)was dissolved in ethanol(50ml). saturated solutions of hydroxylamine hydrochloride and sodium acetate in water were added. The mixture was refluxed on a water bath for one hour. Then it was cooled ‚ poured into water and the solidoxime obtained was filtered. All the oximes were recrystallised from ethanol. S. No. KETONE m.pt.0C 1 1-Methyl -2‚6- diphenylpiperidin-4-one
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