------------------------------------------------- Spectrophotometry has various uses in different fields of science. It can be used in obtaining the concentration and the identity of a solution. In order to test that‚ an experiment was made using the basic concepts of spectrophotometry. This experiment used the properties of light and how much of it is absorbed by the unknown solution. In relation to this method was the so called principle‚ the Beer-Lambert’s Law‚ which was used in getting the relationship of the absorbance and the
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This is termed the hydrotropic effect. Examples of hydrotropic salts include ETH maleate‚ succinate‚ and oxalate2. The hydrotropic effect is achieved by adding an organic salt which will increase the saturation solubility of a drug in an aqueous solution by increasing hydrogen bonding. The mechanism of hydrotropism involves weak interactions between the hydrotropic agent and the insoluble drug. This method closely resembles complexation. Commonly used hydrotropic substances include caffeine‚ sorbitol
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Product Constant Q: Write the equilibrium equation for a saturated solution of the following salts and the corresponding solubility product expressions. a) BaSO4 (s) b) MgF2 (s) c) Ag2S (s) d) Cu(IO3)2 (s) [ ][ [ [ A: [ ( Q: ) ] ][ ][ ] ] What is the equilibrium concentration of Cd2+ ions in a saturated solution made by shaking CdS(s) with water? Ksp = 6.0x10-27 for CdS. [ A: [ Q: ][ ] ][ ] ; ][ ] √ √ A solution in equilibrium with a precipitate of AgCl was found to contain 3.4x10-6M
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test APPARATUS AND MATERIALS: 4% stock solution of glucose‚ water‚ 6 test tubes‚ ruler‚ water bath‚ solution of unknown concentration (Sample A)‚ Benedict’s reagent METHOD: 1. Solutions of different concentration were made from the stock solution and placed in test tubes. 2. All test tubes were labeled appropriately‚ according to table below‚ and Benedict’s test was carried out on the various dilutions for 5 minutes. 3. The colours of the solution were observed and heights of precipitate
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will decrease as the salt in the solution increases. This is because the solution around the potato will draw the water from the potato‚ causing it to decrease in size. Method: To begin this experiment‚ 1½ teaspoons of salt was added to a beaker containing 100 mL of distilled water. This was the 7% solution. 50 mL of this solution was poured into a second beaker and 50 mL of distilled water was added. This produced the 3.5% solution. 50 mL of this solution was added to a third beaker‚ then
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* In a solution‚ the positive hydrogen side of water is attracted to the negative parts if the compound it is dissolving while the negative oxygen is attracted to the positive parts * “Like dissolves like” – describes whether one substance will dissolve in another. Water for example can’t dissolve nonpolar substances Concentrations on Solutions * Solvent: The liquid in which a solute is dissolved to form a solution. * Solute: The minor component in a solution‚ dissolved
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concentrations and a blank solution are prepared and their absorbances are measured with a UV-Vis spectrophotometer (Table 1). The absorbances of three unknown samples with same concentration and a blank are measured (Table 2). The blank solutions are used as a reference solution to calibrate the colorimeter. The volumes of Fe solution for the delivery volume errors in the 10 ml graduated pipet are corrected (Table 3). The molarity (μg/mL) of Fe (o-phenanthroline)32+ in each standard solution is calculated by
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TTI – Case study November 2011 TTI is located in Fort Worth‚ Texas and operates as a specialty distributor of passive‚ interconnect‚ and discrete components. “TTI’s mission is to be the most preferred electronics distributor for their customers and suppliers‚ deliver the right parts exactly on time‚ and to exceed their internal and external customer requirements through continuous improvement‚ while providing a home for hardworking‚ dedicated‚ knowledgeable‚ and ethical people who believe
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settled on its own. We poured out the solution into a paper cup‚ leaving the sand in the beaker. We attempted to heat the sand slowly to dry it out‚ but there was one big splatter that occurred and we lost a tiny bit of sand‚ but we then scrapped the sand out of the beaker and onto the scale to weigh it as best we could. Then adding the paper cup solution to a cup of ice water we watched as the benzoic acid crystalized and floated to the top. We then poured that solution through a filter and funnel into
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The Case Study Question Set: The following questions accompany the case and are both useful in helping the student think about WGD case study content and as a homework assignment due prior to an actual in-class discussion of the case. 1. Draw a system diagram showing the product and information flows between WGD and FastFit‚ starting with FastFit placement of an order through when it makes payment for goods received. This diagram will represent each company as a circle for a total of two
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