Purpose: In this lab‚ a mixture of naphthalene (C10H8)‚ common table salt (NaCl)‚ and sea sand (SiO2) will be separated using the separation techniques in order to demonstrate the properties of mixtures and their ability to be separated by physical means. INTRODUCTION: This lab was based on the separation of the components of a mixture. A mixture can be defined as a physical combination of two or more pure substances. Separation techniques are used to separate components that are not chemically
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www.hbr.org SPOTLIGHT ON SOCIAL MEDIA AND THE NEW RULES OF BRANDING Branding in the Digital Age by David C. Edelman • You’re Spending Your Money in All the Wrong Places Included with this full-text Harvard Business Review article: 1 Article Summary Idea in Brief—the core idea 2 Branding in the Digital Age: You’re Spending Your Money in All the Wrong Places Reprint R1012C SPOTLIGHT ON SOCIAL MEDIA AND THE NEW RULES OF BRANDING Branding in the Digital Age You’re Spending Your
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Questions: 1. Why is a conical flask‚ rather than a beaker‚ used in the experiment? – To allow easy mixing of solutions by swirling. 2. Why is the funnel removed from the burette after adding the acid solution? – so that the drops from the funnel will not fall into the burette. 3. In using a burette‚ why is it important to (a) rinse it with a little of the solution it is going to contain? – to remove any residual water and so avoid dilution of the acid solution when it is poured into the burette
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added and white flakes are formed. More acid is added until the pH paper turns red. The round bottom is filled with white precipitate. The precipitate is put onto a hirsh funnel that uses vacuum filtration to isolate the precipitate. The product is then added to a beaker with D.I water and heated. It’s put through the hirsh funnel . 3.68 grams of salicylic acid is recovered. The melting point is tested to compare to a perfect sample. The melting point is 146C0. The product is dried and added to a beaker
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Soxhlet extractor From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search A schematic representation of a Soxhlet extractor 1: Stirrer bar 2: Still pot (the still pot should not be overfilled and the volume of solvent in the still pot should be 3 to 4 times the volume of the soxhlet chamber) 3: Distillation path 4: Thimble 5: Solid 6: Siphon top 7: Siphon exit 8: Expansion adapter 9: Condensor 10: Cooling water in 11: Cooling water out Animation describing mechanism of Soxhlet
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client. Because of uncovering work‚ underground resources like gas‚ water‚ electric links and sewage funnels can get harmed‚ which could bring about grave or conceivably deadly events including smolders‚ electric stun and gas discharges or upheavals. By the unpredictable impacts of arcing current wounds can be brought about. It might bring about risky flames or blasts when a live link or gas funnel is cut or trampled by an excavator compartment or entered by the purpose of an apparatus. At the point
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Extraction and crystallization- The purpose of this lab was to extract and crystallize compounds in a mixture using acids and bases. 1 gram of the unknown was dissolved into 30 mL of ethyl acetate. The mixture was then transferred to a separatory funnel. Using aqueous solutions of different pH we were able to separate organic acids‚ bases and neutral compounds from each other. Using three 10 mL portions of HCl‚ we reacted the HCl with the base in solution. This made it possible to extract the base
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In each of the following pairs of sentences‚ choose the sentence that uses--or omits--commas correctly. 1. A. What are Web logs or‚ blogs? B. What are Web logs‚ or blogs? 2. A. Web logs‚ one of the newest types of documents on the Web‚ are very popular. B. Web logs‚ one of the newest types of documents‚ on the Web are very popular. 3. A. In 1998-1999 very few Web sites could be called‚ Web logs. B. In 1998-1999‚ very few Web sites could be called Web logs. 4. A. Eventually‚ these types
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calculations). The low yield was due to various sources of error in the performed experiment. Sources of error that led to a loss of product were filtering of the product with the gravity filter and the Hirsch funnel‚ as it was difficult to obtain the entire product from the filter paper and the sides of the funnel. As the experiment follows a semi microscale technique even a small amount of lost product yields a great loss in the yield 4. These sources of error could be minimized by doing a larger reflux in
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bath until 10°C was reached. The solution was then transferred into a separatory funnel‚ and was added to the round bottom flask solution dropwise over ten minutes while agitating. The contents of the round bottom flask were poured into a beaker with 40 g of ice and 35 ml of 6M HCl. The flask was then rinsed with three 20 mL portions of water‚ and poured into the beaker. The solution was filtered through a Buchner funnel‚ and washed with 20 ml of cold
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