properties In liquid solutions‚ particles are close together and the solute molecules or ions disrupt intermolecular forces between the solvent molecules‚ causing changes in those properties of the solvent that depend in intermolecular attraction. For example‚ the freezing point of a solution is lower than that of the of the pure solvent and the boiling point is higher. Colligative properties of solution are those that depend on the concentration of solute particles in the solution‚ regardless of what
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carbonate solution and pH indicator phenolphthalein will be added ahead of lipase enzyme; when the pH is below 8.2‚ phenolphthalein will turn from pink to colourless. Sodium carbonate solution is added in order to turn the solution alkaline and the indicator pink then back to colourless after lipase is added to catalyse the chemical reaction and speed up the breakdown of lipids into fatty acid in the milk. Fatty acid produced then is going to neutralise the solution with sodium carbonate solution added
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substances in solution. It compares the colors of a known and an unknown solution‚ that comparison then leads to a quantitative estimate of the concentration of trace amounts of colored materials in that solution. Chemicals and Materials 40 mL standard Tartrazine solution Yellow Dye Safety goggles 100 mL beaker De-ionized water Cuvette Lint-free Tissue Gloves (Latex-free) Spectrometer with Labquest Logger-Pro USB drive Procedure Acquire 40mL of the standard tartrazine solution in a 100mL
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rn of the polynomial we can construct the solutions y1 ‚ . . . ‚ yn ‚ such as y1 = er1 x . We can also rewrite the equation in a weird-looking but useful way‚ using the symbol d D = dx . Examples: equation: y − 5y + 6y = 0. polynomial: r2 − 5r + 6 = 0. (factored): (r − 2)(r − 3) = 0. roots: 2‚ 3 weird-looking form of equation: (D − 2)(D − 3)y = 0 or (D2 − 5D + 6)y = 0. linearly independent solutions: y1 = e2x ‚ y2 = e3x . general solution: y = c1 e2x + c2 e3x . equation: y + 10y +
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concentration of the unknown bromophenol blue solutions. 4. To determine the concentration of two different solutes‚ bromophenol blue and methyl orange in a mixture. Materials and Methods: Refer to Biological Science practical manual page 5-11. Results: Part 1: Determination of Amax of bromophenol blue The wavelength with maximum absorbance reading form the graph is 590nm. Part 2: The effect of concentration on absorbance of bromophenol blue solution Tube 1 2 3 4 5 6 Distilled water (ml) 2.5
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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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