(°C) Final Temp. (°C) Endothermic/ Exothermic Sodium Hydroxide NaOH 16.5 19.8 Exothermic Ammonium Chloride NH4Cl 15.5 Endothermic Sodium Acetate NaCH3COO 16.2 Slightly endothermic Sodium Chloride NaCl 16.5 Neither Part B Ammonium Chloride and Barium Hydroxide Equipment and procedures (In book) Results (observations) A white solid forms in the bottom of the test tube after vigorous shaking;
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This article was downloaded by: [CIMAP Central Institute of Medicinal & Aromatic Plants] On: 07 March 2013‚ At: 21:43 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House‚ 37-41 Mortimer Street‚ London W1T 3JH‚ UK Natural Product Research: Formerly Natural Product Letters Publication details‚ including instructions for authors and subscription information: http://www.tandfonline.com/loi/gnpl20 Investigation on
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Synthesis and Analysis of the Coordination Compound Pentaaminechlorideocobalt (III) Chloride Heaven Lin and Forest Lin W.M. Keck Science Department‚ Claremont McKenna‚ Pitzer‚ and Scripps Colleges 925 N. Mills Avenue‚ Claremont‚ California 91711 Abstract Through using the spectrometer and titrations‚ the amount of the coordination compound‚ pentaaminechloridocobalt (III) chloride‚ was determined through a synthesis through an oxidation reduction of cobalt (II) chloride hexahydrate (CoCl2·6H2O)
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Kalamkari the ancient Indian art of painting Kalamkari refers to a method of painting natural dyes onto cotton or silk fabric with a bamboo pen or kalam. The name kalamkari translates as pen (kalam) work (kari) in Hindi/Urdu‚ and was most likely derived from trade relationships between Persian and Indian merchants as early as the 10th century CE. European merchants also had names for this type of fabric decoration: the Portugese called it pintado‚ the Dutch used the name sitz‚ and the British preferred
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the solution was allowed cooled for 2-3 minutes. The dark black solution was filtered through a gravity filtration system‚ leaving dark residue behind on the filter paper‚ and colorless to slightly pink liquid in the beaker. Then‚ 9 mL of sodium acetate buffer‚ to maintain a relatively constant pH and 1.8 mL of acetic anhydride were added to the solution‚ and then it was mixed and heated for about 5 minutes. Then‚ to induce crystallization‚ the beaker was placed in an ice bath. The slightly white
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chemicals. The modern day chewing gums are made of four major ingredients including synthetic rubber‚ plastic‚ sugar‚ and coloring (dye). Modern day gums are produced from synthetic polymers such as styrene- butadiene rubbers and polyvinyl acetate. The final product is composed of 60% sugar‚ 20% corn syrup‚ and only 20% actual gum material. People do not typically swallow gum‚ so they pay very little attention to the ingredients. The assumption is that if it is not swallowed‚ then it
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Date: May 22‚ 2012 Name: Cristhian Valor Organic Laboratory Pre-Lab 1. Main reaction sequence including side reaction products: 2. 3 Sentence Summary of the Experiment: The OH group on the benzene ring in salicyclic acid reacts with acetic anhydride to form an ester functional group. Thus the formation of acetylsalicyclic acid (aspirin) is referred to as an esterification reaction‚ which requires the presence of H+ (H2SO4 in our case). The technique used to purify the aspirin content
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silicate‚ artisans also helped with the discovery of a bright yellow made from lead and antimony oxides‚ the vinegar fumes used to corrode lead and copper into lead white 2PbCO3•Pb(OH)2‚ and green also known as verdigris copper(II) acetate. The red color known as vermillion demonstrated an important cross between are and chemistry in color. Vermilion is made up of mercury sulfide‚ which has been used as a pigment since roman times. Chemists discovered that by making the compound by purposefully combining
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EXPERIMENT 4 Title: Preparation of magnesium sulphate. Date:11.02.2010 Aim: To prepare magnesium sulphate Theory: Magnesium sulfate (or magnesium sulphate) is a chemical compound containing magnesium‚ sulfur and oxygen‚ with the formula MgSO4. In its hydrated form the pH is 6.0 (5.5 to 6.5). It is often encountered as the heptahydrate‚ MgSO4·7H2O‚ commonly called Epsom salt. Anhydrous magnesium sulfate is used as a drying agent. Since the anhydrous form is hygroscopic (readily absorbs water
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our buffer 2 solution. Buffer 1 has a pH of 5.12 while buffer 2 has a pH of 5.66. This would be because buffer 1 has a higher concentration of acid. Buffer 1 contained 12mL of acetic acid and 34mL of sodium acetate‚ while buffer 2 contained only 3mL of acetic acid‚ and 44mL of sodium acetate. Buffer 1’s pH would be lower because it contains a higher amount of acid‚ on top of a lower amount of base‚ as compared to the amounts of acid and base in the buffer 2 solution. 2. What is the difference between
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