CHE 151-50 Fall 2013 Lab report Isolating the Components of a Three Component Mixture The purpose of this experiment was to separate the component of three mixtures sand‚ sodium chloride and calcium carbonate then calculate the percentage by mass of each component recovered from the mixture. The other purpose of this experiment was to show us the students the concepts associated with physical and chemical properties of substances. Me and my lab partner‚ obtained a mixture of a un known
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interaction‚ in which the non-electrolyte could be less soluble at high salt concentrations. It is used as method of separating proteins. This experiment uses ammonium sulphate to force the precipitation of α-amylase using the salting out process. The solubility of a protein is dependent on the salt concentration in the solution. Ideally “the greater protein concentration‚ the better recovery you will have”‚ (Anfinsen‚ 1968). Tube no. 4 showed the greatest recovery however this tube contained the second
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Gravimetric Analysis: The Determination of Phosphorus in Plant Food Gravimetric analysis is a quantitative (i.e. how much?) method of classical analysis. The element to be determined is isolated in a solid compound of known identity and definite composition. The mass of the element that was present in the original sample can be determined from the mass of this compound. Plant foods contain three essential nutrients that are not readily available from soils. These are soluble compounds
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Lab 1: Scientific Method Using Lifesaver Elia Ocasio Bio 121 K.L. Box Performed: August 29‚ 2013 Submitted: September 5‚ 2013 Introduction The solubility depends on the properties of a solvent that will allow interaction with a solute more strongly than do solvent particles together. Water is the universal solvent. Water‚ certainly dissolves many types of substances and in greater amounts than any other solvent. The salt is a compound consisting of various minerals‚ and is one of the most abundant
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CHM130 Lab 9 Chromatography Name: Karlee Rose A. Data Table (12 points) Paper # Color Source Solvent Distance Component Moves Distance Solvent Moves Rf value 1 Yellow M&M Candies 0.1% Salt Solution 28.88mm 42mm 0.69 2 Yellow Reese’s Pieces 0.1% Salt Solution 16.95mm 32mm 0.53 3 Purple Grape Soda 0.1% Salt Solution 32.15mm 51mm 0.63 4 Purple Grape Koolaid 0.1% Salt Solution 12.12mm 31mm 0.39 5 Red Easter Egg Dye 0.1% Salt Solution 1.18mm 7mm 0.17 6 Red Dry Erase Marker
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[OH-]. This caused the [OH-] to be considerably reduced‚ and the NH4OH to become an even weaker base. The pH was decreased as the [OH-] was decreased. In solutions with more basic pH there would be a shift towards the products and a decrease in the solubility of certain precipitates. When (NH4)2CO3 was added to the solution there was a reaction with the ions present in the unknown solution to form in this particular unknown solution: BaCO3 and SrCO3. If Ca2+ was present then CaCO3 would have formed
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Carbopol 940 could yield clear gel with desired rheological property. Carbopol 940 was selected as a gelling agent based on preliminary experiments and previous reports due to its widespread use in pharmaceutical formulations and fast dispersion in water (Sahoo et al.‚ 2014; Sharma and Bedi‚ 2014; Pillai et al.‚ 2015). Moreover‚ it is speculated that Carbopol with low concentration can be safe for nasal administration (Khan et al.‚ 2010). Carbopol is known to have mucoadhesive properties. It
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Abstract This work describes the extraction of caffeine from tea leaves to determine its % caffeine. The extraction process selectively dissolves one or more compounds in a mixture into an appropriate solvent. In this experiment‚ it was visible in the process wherein the components of the tea leaves were dissolved in two solvents‚ water and dichloromethane (DCM)‚ with DCM used for multiple extractions. The organic layer was evaporated and the determined % caffeine was 0.12%. Furthermore‚ the purified
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Our company name: Virtual Pharmaceutical Drug name: VPL874C (Market name = Betatrix) Possible indications = migraine prophylaxis‚ hypertension‚ coronary heart disease Problem – want oral dosage form. - but has short half life (3-4hr) Solution – oral dosage form with extended release which releases drug slowly so that the plasma concentrations are maintained at a therapeutic level for a prolonged period of time (usually between 8 and 12 hours). Recent extended release formulations
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Effects of curing condition of solution cast Nafion® membranes on PEMFC performance Korean J. Chem. Eng.26(3)‚ 679-684 (2009) Thickness of membrane ~ 50µm There are some disadvantages of the solution casting method that the cold cast films are generally mechanically weak‚ susceptible to crack formation and soluble in many polar solvents‚ especially in water at room temperature. Generally‚ the annealed films undergo morphological changes when heated above the glass transition temperature (Tg=109oC
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