Purity of Aspirin Objectives - To research‚ using various sources‚ the history of aspirin‚ its use in medicine‚ methods of synthesizing it and of measuring its purity - To compare the % purity of a branded aspirin tablet with a generic aspirin tablet - To compare 2 methods of composition analysis of the two types of aspirin Research
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ent‚ and whether the movement was at a constant rate or changed. Hypothesis: If the slope is more steep‚ then the glacier’s movements will be faster than a less steep slope. Materials: Flubber Glue Water Borax Long tray Timer Procedure: 1. Create the flubber. 2. Split the flubber evenly into 2 parts. 3. Roll both parts into balls. 4. Set the tray in three different spots with different slopes and measure the angle. a. Tray leaning on seat of a chair 15
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Period 6 February 18‚ 2014 Sources: www.chemicalelements.com www.chemicool.com http://periodiclanl.gov/default.htmn education.jlab.org Boron B Atomic Number: 5 Atomic Mass: 10.811 amu Origin of Name: From Borax and Carbon Name of Person/People who discovered Boron: Sir Humphry Davy and J.L GayLussac Date of Discovery: 1808 Common Uses: 1. Boron oxide (B O ) is used in glassmaking 2 3 and ceramics. 2. Boron carbide (B C) is used in tank armor
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idea‚ so I just use this for my slogan. Boron is a chemical element with chemical symbol B and atomic number 5. It is in period 2‚ Group 13 element that has properties which are nonmetals. The name boron comes from the Arabic and Persian words for borax. Boron was discovered by Sir Humphrey Davy‚ Joseph-Louis Gay-Lussac‚ and L.J. Thénard at 1808 in England‚ France. Boron exists in the earth ’s crust to the extent of only about 10 ppm. Boron is solid and black. It is very hard and in extremely pure
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its: * superoxide * peroxide * monoxide * dioxide vii) A mixture of Aluminium nitrate and Aluminium powder is called: * Duralumin * Ammonal * Carnallite * Alum viii) Ca2B6O11.5H2O is the chemical formula of: * Cryolite * Colemanite * Bauxite * Borax ix) The formula of Hypochlorous acid is: * HOCl * HClO2 * HClO3 * HClO4 x) The metal ion having the highest number of unpaired electrons is: * Mn2 * Fe2 * Co2 * Ni2 xi) The chemical name of laughing gas is: * Nitric oxide * Nitrous oxide
Free Oxygen Chemical element Nitrogen
Modified Winkler method for dissolved oxygen determination Abstract In this study the group has determined the presence of oxygen in sample through a modified winkler method. The amount of oxygen is determined through a series of reaction. A body of water can sustain life if dissolved oxygen is sufficed. Depletions in dissolved oxygen can cause major shifts in the kinds of aquatic organisms found in water bodies. Introduction The amount of dissolved oxygen present in water or wastewater
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In the middle to late 1800s‚ there was a period in history commonly known as the Gilded age. It was called the Gilded age because immigrants from around the world saw the life in the United States as a magical world of easy living‚ but when they actually got to the U.S they were severely let down‚and plagued with a life of suffering and hardships. In Upton Sinclair’s novel The Jungle he does an amazing job of illustrating one of the biggest conflicts in the immigrants lives. During this time‚ the
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2(22.99)+1(12.01)+3(16)g/mole = 0.2329g 105.99g/mole =2.197×10-3 moles From the equation ‚ 1 Mole Na2C03 react 2 mole HCl So‚ 2.197×10-3 moles Na2C03 = 2.197×10-3x 2 1 = 4.394x10-3 mole HCl Thus‚molarity HCl = n/v = 4.394x10-3 mole 42.87x10-3L = 0.1025 M. The suitable indicator is phenolphthalein. Primary standard
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the coin using a triangular file. 2) Place the penny in a 50 mL of a pre-determined concentration of HCl solution overnight. 3) Then determine the percent copper from the mass of copper. 4) Find the percent of zinc by precipitation and titration 5) If there is a known amount of HCl added to the beaker that penny is placed in‚ then determine the amount of HCl that was used up in the reaction of HCl and Zinc. Calculate the % of zinc in penny. 6) If zinc reacts with NaOH in the titration experiment
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chloride (HCl) : Formula : HCl Nature : Covalent. Molecular Mass : 36·5u [i.e. HCl = 1 + 35·5 = 36·5] Occurrence : (i) Present in gastric juices. (ii) Present in volcanic gases. Laboratory preparation of HCl gas : Hydrogen chloride gas is prepared in laboratory by heating conc. H2SO4 with NaCl. NaCl + H2SO4 Heat → NaCl + NaHSO4 Heat → NaHSO4 + HCl Sodium hydrogen sulphate Na2SO4 + HCl Sodium sulphate (g) (g) ↑ ↑ Physical Properties of HCl : (i)
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