Benzoic Acid Purpose: The purpose of this experiment is to purify benzoic acid by crystallization. Procedure: 1. 0.5g impure benzoic acid was placed in a 50mL Erlenmeyer flask. 15mL of water was added and the mixture was heated to a boil on a hot plate. 0.5mL of water was added to the flask‚ while swirling the flask. The mixture was boiled until the benzoic acid completely dissolved. The total volume of water used was recorded. The black solid that remain in the dissolved mixture was the
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Acids And BAses Acids And BAses 8.1 8.2 8.3 8.4 18.1 18.2 18.3 18.4 18.5 Theories of acids and bases Properties of acids and bases Strong and weak acids & bases The pH scale Calculations involving acids and bases (AHL) Buffer solutions (AHL) Salt hydrolysis (AHL) Acid-base titrations (AHL) Indicators (AHL) 8 8.1 THeORies OF Acids And BAses 8.1.1 Define acids and bases according to the Brønsted–Lowry and Lewis theories. 8.1.2 Deduce whether or not a species could act as a Brønsted–Lowry
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sales manager at Granite‚ Rock and Sand‚ and is in jeopardy of losing his job if he does not improve his unit’s sales performance. Joe cannot afford to lose his job because he will not be able to pay his mortgage on his new home. He began to interview candidates for a vacant position in this unit‚ where he is approached by a candidate‚ Jessica Morris‚ a former employee of Granite’s competitor‚ Silt‚ Sand and Such. She offered Joe inside information on Silt‚ Sand and Such that would help solve his
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ICSE Class X Chapter 5 Hydrogen Chloride and Hydrochloric Acid Hydrogen 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
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A study of municipal solid waste management system adopted by various municipalities Presented to: Prof. Dr. Dev Raj Adhikari Faculty of Management Tribhuvan University‚ Kirtipur Prepared by: DamodarNiraula Laxman Raj Kandel Kishore Dhungana Nischal Thapa YogendraAdhikari Master of Philosophy in Management August‚ 2013 Tribhuvan University Kirtipur‚ Kathmandu Table of Contents INTRODUCTION Background Waste is a resource that is unutilized
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BENZOIC ACID & BENZOATES (210 –218) • Retards growth of bacteria and yeasts • Occurs naturally in many foods – a similar distribution to salicylate (but at a lower dose than as an additive) • Common food sources: Soft drink‚ cordial‚ fruit juice and cider Liquid essences and syrups Iceblocks‚ jelly‚ low joule jam‚ dips‚ pickles‚ olives Fish marinades and preserves • PABA (para-amino-benzoic-acid)
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Sand Dams in Kenya WHAT IS A SAND DAM? A Sand Dam is a steel reinforced concrete wall built across a sandy riverbed. During rainy seasons‚ a seasonal river forms and carries soil (consisting of sand and silt) which moves downstream. The heavy sand builds up behind the dam‚ whereas lighter sand and silt washes over the wall of the dam. Within the space of one to four rainy seasons‚ these dam types get completely filled with sand. However‚ approximately 40% of the volume held behind the dam
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widespread concern over the noticeable issue of sand storm. A numerous countries are suffering from it. With the increasing of the fierce competition among countries‚ sand storm are gradually getting grievous because per countries extremely exploit source and cut down the tree to structure the building in order to develop country‚ which seriously jeopardize the solid. Sand storm increasingly brings about damage‚ which should not be neglected. So preventing sand storm is of strategic significance for human
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In the novel‚ House of Sand and Fog‚ the author Andre Dubus develops the idea that individuals are constantly struggling to balance their external and internal demands. The Most common external demands that individuals have is the desire to achieve a loving marriage‚ own a home‚ have a decent job that provides respect‚ to be financially stable and to be proud of oneself‚ within family and community. On the other hand‚ the most common internal demands are to have happiness‚ love and strength to cope
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Sand dollars are extremely interesting! They have many details‚ which were crafted by God. Below a sand dollar‚ there is hair like spines that intriguingly help them eat. Amazing sand dollars’ mouth is located in the center of their bottom half. When they eat‚ they use their hair like spines to move food towards their mouth. Sand dollars have a very small jaw with only five teeth‚ which means they can only eat miniscule things. Although sand dollars are typically seen with white coloring‚ when alive
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