a calibration curve we would make solutions of different concentrations of ethanol. Using a 25cm3 volumetric flask we would put 10cm3 of 25% Propanol into each one which would act as an internal standard. We would then add differing amounts of ethanol (0.5 cm3‚ 1.0cm3‚ 2.0cm3and 4.0cm3) and then top the volumetric flask up with distilled water. These would act as our standards to create a calibration curve. These standards are shown below in Table 1.0 Solution number | Volume of 25% propanol (cm3)
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results exposed in the recollection of data. ▪ How to prepare a dilute solution from a more concentrated one: Vf . Cf = Vi . Ci ▪ We should do every experiment twice‚ in order to check the results. ❖ POTATOE TUBERS: Materials: potato tuber (large)‚ boiling tubes with stoppers x 12‚ boiling tube rack‚ scalpel‚ a pair of tongs‚ 2 pipettes (± 0‚1ml)‚ balance (±0‚1g)‚ 2 beakers‚ marker‚ sucrose solutions (0.0M‚ 0.1M‚ 0.2M‚ 0.3M‚ 0.4M‚ 0.5M)‚ distilled water‚ filter paper‚ cork
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number of osmoles of solute per liter in solution. So‚ what does osmolality depend on? It mostly depends on number of particles in chemical solution but not the identity of molecules and ions. Since we were dealing with elodea and NaCl (which is M) and were trying to figure out which molarity would cause us to get isotonic solution. Based on the experiments that we before trying to figure out the isotonic solution‚ we were doing hypotonic and hypertonic solutions‚ so we had a slight idea what to do and
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substance in solution at different wavelengths of radiant energy. Light passes into a monochromator where only a very narrow range of wavelengths can pass through. From there‚ light is transmitted through a sample solution‚ and on to a phototube where the light energy is converted to an electric current that is registered on a meter. To measure the amount of light absorbed by the solutes in sample solution‚ comparison to the initial intensity of light reaching the solution is needed. Each solution with a
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various problems in life‚ I find it very useful to identify what I consider to be the most direct solution‚ regardless of how I feel about actually implementing it. I find this to be the most clear and direct why to get around my problems. Many problems have multiple solutions‚ but often the solution require persistence to implement. But if we can somehow get myself to follow through‚ I know the solutions will actually work. One of the problems I faced was when I had an interest in starting a new
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membrane. It allows water and oxygen to move freely across the membrane. Osmosis only has an effect when the cell is in a hypotonic or hypertonic solution. A hypotonic solution is when the salt concentration
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designed to study the effect of a concentrated solution applied to white and sweet potatoes. The solution’s impact among the potatoes were to be either hypertonic‚ hypotonic‚ or isotonic. The potatoes were first cut into fries with a fry cutter‚ and then weighed after being cut. The white and sweet potatoes’ weights ranged from .005-.015 grams. A total of 18 sugar solutions are to be made over the course of 3 trials. In each trial‚ 6 different types of solutions are to be made. (0% sugar‚ 10% sugar‚ 20%
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membrane and goes to the higher concentration of solute.1 2.2. Important factors to Osmosis and Diffusion include Temperature‚ Concentration and Surface area to volume ratio. Temperature can affect the rate in which a solute dissolves in a solution‚ higher temperature faster rate of Osmosis. This is caused by the molecules movements being faster in higher temperatures. Concentrations are important as they affect the movement of solute within a solvent‚ the lower the concentration the faster
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selectively permeable membrane on diffusion and osmosis between two solutions separated by a membrane. Hypothesis: Procedures: In lab manual Material: In lab manual Background Information: Data: Table 1 Diffusion of glucose and iodine. | Color | Glucose | Time | Dialysis Bag | Beaker | Dialysis Bag | Beaker | Start | | | | | 30 minutes | | | | | Table 2 Osmosis Investigation – Water gain by dialysis bags Solution | Dialysis BagInitial Mass (g) | Dialysis BagFinal Mass (g)
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Question: investigate the water potential of potato tissue? Introduction All cells require essential materials to ensure their survival. Chemical‚ physical‚ and biological processes are used to move these materials inside of cells. Similar processes move waste materials outside of cells. These processes can be passive‚ occurring as a result of basic physical laws and requiring no outside energy from the cell or they can be active‚ requiring energy expenditure. Since all molecules possess kinetic
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