solution was then calculated. Mechanism: Results: Mass of conical vial 10.36 g Mass of conical vial with distillate 11.17 g Mass of distillate (mass of vial-mass of vial with distillate) 11.17 g – 10.36 g = 0.81 g Volume of distillate using automatic pipet 1 mL Density of distillate (mass of distillate/volume of distillate) Percent composition by weight of ethanol using table on page 006 ~90% Percent composition by volume of ethanol using table on page 006 ~93.3% Percent Yield: Theoretical Yield:
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Class average for a 80 and 120 drop count was recorded to be 0.041+/- 0.005 mL/drop. If a graduated cylinder is not available there is another way of adding more of the solution. The disposable pipet can transfer 0.5mL of the solution to the chemical reaction. When comparing a 10mL graduated cylinder‚ a 100mL beaker‚ and a 50mL graduated cylinder‚ the most precision peace of glass wear would be the 10 mL graduated cylinder with the true volume of water (calculated)‚ class average‚ and uncertainties
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Experiment 11 Title: Spectrophotometric analysis of caffeine and benzoic acid in soft drink. Name: Tan Herh Lim Name of partner: Sia Ting Wai‚ Chong Zheng Yee Date: Lecturer: Dr. Neo Kian Eang Practical class: P1 Objective: To obtain the absorbance of the caffeine and benzoic acid in soft drinks. Introduction Soft drinks that commonly found in our daily life contain caffeine and sodium benzoate. The caffeine act as a stimulant and the sodium benzoate acts as a preservative
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[Downloaded free from http://www.www.ijpsonline.com on Friday‚ July‚ 4 2008] www.ijpsonline.com Short Communications Spectrophotometric Method for Determination of Tablets Glucosamine in Tablets PRIYA GAONKAR‚ VINEETA KHANVILKAR‚ RAJANI SHETTIGAR AND CHHAYA GADGOLI* Saraswathi Vidya Bhavan’s College of Pharmacy‚ Sonarpada‚ Dombivli (East)-421 201‚ India. A rapid and sensitive method has been developed for the determination of glucosamine sulphate from tablets by UV-spectrophotometery
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This was done in order to calibrate the spectrophotometer. The wavelength setting was set on the spectrophotometer at 620nm and the machine was set absorbance‚ listed as unit (A). The student set the blank to zero absorbance and finished the calibration of the spectrophotometer. The solution in the test tube was then discarded and the test tube was set
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paper‚ 5 cm x 5 cm for weighing chemicals‚ (1) colored drink‚ (1) beaker‚ 100 mL‚ glass (1) burner-fuel‚ (1) burner-stand‚ (1) cylinder‚ 25 mL‚ (1) 23-mL volumetric flask‚ (1) Pipet‚ Serological 2mL‚ (1) Bulb‚ Rubber (1) Goggles-Saftey‚ (1) Scale-Digital-500g‚ (1) Test Tube (1)‚ 13 x 100 mm‚ (1) Thermometer‚ (1) Bolt‚ (1) Magnet bar‚ (1) Pipet‚ Empty Short Stem The following steps were taken: Prior to commencing the experiment all scientific measurements were reviewed‚ along with formulas to convert
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Cameron White Principles of Chem Reactivity Dr. Singleton Comparative Analysis of McCloud’s Run and Indian Creek There are four important traits of any water stream in the natural world. The chemistry of the stream affects the ecosystem of the stream which includes people who utilize the water of the stream for various uses. Many factors play a part into the chemistry of the water such as the temperature‚ the pH‚ the turbidity‚ the conductivity‚ and the dissolved oxygen (A.K.A. DO) (1). Those
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SPECTROPHOTOMETRY ABSTRACT To determine the concentration of copper in an unknown solution by using copper complexation‚ solvent extraction and spectrophotometry. Standards are used to create a calibration curve and the unknown concentration of copper is then calculated by using the linear equation from the calibration curve. The concentration of copper in the unknown solution 201 was found to be 12.57± 0.25 μg/mL. INTRODUCTION Copper is an essential mineral in everyday life‚ it is in necessary for the
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Redox Titration Analysis of a Commercial Bleach A. Purpose ! ! ! To review oxidation-reduction reactions and their stoichiometry. To learn the concept and technique of redox titration. To determine the percent (m/v) of an active ingredient‚ sodium hypochlorite (NaOCl)‚ in a commercial bleaching agent. B. Theoretical Background Whereas acid-base reactions involve the transfer of a proton‚ oxidation-reduction or redox reactions involve the transfer of electrons from one substance to
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Enhanced spectrofluorimetric determination of Mebendazole‚ a benzimidazole anthelmintic drug‚ through complex formation with Lanthanum (III)‚ in pharmaceutical preparations and spiked human plasma Abstract The article concerned with the development of simple‚ sensitive‚ rapid and specific spectrofluorimetric procedure for determination of mebendazole. The cited drug was reacted with lanthanum (III) ions to produce highly fluorescent stable complex measured at 340 nm after excitation at 295 nm. Different
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