Sulfuric acid

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    and shake well by inverting the bottle several times. Repeat shaking after floc has settled halfway. Allow floc to settle a second time. 5. Add 1 mL of concentrated sulfuric acid by allowing the acid to run down the neck of the bottle above the surface of the liquid. 6. Restopper, rinse the top of the bottle to remove any acid and shake well until the precipitate has dissolved. 7. Titrate a volume of treated sample which corresponds to 200 mL of the original sample. This corrects for…

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    1) First, melting candle wax is a physical change. When heated, the candle wax, which is opaque, white and has a hard, waxy feeling, changed from a solid to a liquid. The hot wax became more of a transparent white and after cooling time, the hot wax changed back into a solid. Changing back into its original state suggests physical change. But, burning candle wax shows evidence of both physical and chemical change. The melting of the wax is an example of physical change, the heat source caused…

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    Part One: Conductive behaviour of graphene/carbon nanotube and graphene oxide/ carbon nanotube hybrid materials Experimental Introduction Although many CNTs and graphene based electrodes have been developed with outstanding properties, drawbacks are still noticeable using some methods. For instance, EPD method commonly produces unsatisfied CNTs film strength and on the other hand, CVD technique is costly. Moreover, graphene based electrodes needs lots of labour works which is time consuming…

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    tetrabutylammonium hydrogen sulfate as PTC. NaBH4 and CoCl2 in 2:1 THF: H2O used for the reduction of VF-I to obtain 1-(2-amino-1-(4-methoxyphenyl)ethyl)cyclohexanol (VF-II). Further, venlafaxine derivative of the amino acid -carboxamide (VFCA-I toVII ) synthesized through coupling of N-Phthaloyl amino acid chloride derivative (2a-2g- synthesis reported in chapter-1) with 1-(2-amino-1-(4-methoxyphenyl) ethyl)cyclohexanol (VF-II). All the chemicals used are of laboratory grade and purchased…

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    Silver Tarnishing Lab

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    The tarnishing of silver is due to a chemical reaction between silver and hydrogen sulfide, producing silver sulfide and hydrogen gas. The balanced chemical equation is 2Ag (s) + H2S (g) → Ag2S (s) + H2. This is a single replacement reaction. This reaction most commonly occurs through contact with hydrogen sulfide in the air - although direct contact with substances that contain sulfur can cause tarnishing. Silver tarnishes very quickly when it is exposed to air that contains high levels of…

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    Air pollution is a mixture of natural and man-made substances in the air we breathe. It can be divided into two main categories: indoor air pollution and outdoor air pollution. Outdoor air pollution takes place outside the natural built environment. The main types of outdoor pollutions are: Ozone, Particulate matter, Carbon Monoxide, Nitrogen Oxides, Sulfate Dioxides, Lead. The health effects are risks associated with outdoor air pollution varies depending on age and previous health/medical…

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    1. Identify the key technical characteristics of the Daguerreotype and Calotype processes. Illustrate your answer with examples of images form each technology, and say how they reflect its characteristics. (25%) Before the invention of the wet collodion process, which produces an unlimited number of copies of finely detailed images on paper and to print, by Frederick Scott Archer in 1851, there were two photograph processes previously: the daguerreotype and the calotype. The…

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    Nitric acid and brass pellets (copper) were set to react under a fume hood. The scientist observed the once liquid acid turning a green color, and the release of an orange gas due to violent fizzing/bubbling on the surface of the copper pellets: a chemical reaction. Because nitric acid is a very strong acid that is weakly bonded, it violently reacts with the metal. After about 30 minutes, the scientist noted…

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    Purpose: The purpose of this lab is to prove and discern the empirical formula of copper oxide using the Law of Conservation of Mass. This states that in measuring the mass of each component of copper oxide and determining the percent composition of each the copper and the oxygen within copper oxide it is possible to find the ratio of the elements within the compound. Procedure: In order to conduct this lab, 25.1mL of distilled water then 25.5mL of 3M HCl must be added 2.11g of copper oxide.…

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    Iodometry Lab Report

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    basic solution. Adding H2SO4 will bring the solution to a lighter blue color, indicating that it is slightly acidic to neutral. As discussed previously, this will prevent iodide from being oxidized by atmospheric oxygen in the presence of excess acid. In addition, it also prevent Cu(OH)2 from precipitating in the solution due to an highly basic environment. Finally, H3PO4 is added to the solution to prevent Fe3+ in brass from being reduced to Fe2+ by iodide since phosphate will form a…

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