and 10: Volumetric/Vinegar Analysis Abstract: The goal of the experiment that was conducted was to figure out both the molar concentration of NaOH and the standard mole ratio of the NaOH solution. In order to find the concentration of the NaOH solution‚ volumetric analysis was used. In volumetric analysis‚ a titration mechanism was utilized in order to find the reaction that the base will end up having with KHC8H4O4.‚ also known
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AP Biology August 23‚ 2012 Egg Osmosis Lab Definition of osmosis: The diffusion of water across a selectively permeable membrane from high to low concentrations Hypothesis: If I place an egg in vinegar‚ then the outer layer of the egg is going to become slimy and look like rubber. It will also become larger and bubbles will form on and around the egg. Hypothesis: If I place an egg in corn syrup‚ then the egg will become small and the outer layer will not look like rubber any longer. Day one:
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plasmolysis of onion cells (Allium cepa) using NaCl (Sodium Chloride) concentrations of 0.1M‚ 0.2M‚ 0.3M‚ 0.4M‚ 0.5M‚ 0.6M Design Research Question (Aim): The aim of this lab was to determine the point of incipient plasmolysis of onion (Allium cepa) cells using Sodium Chloride (NaCl) concentrations of 0.1M‚ 0.2M‚ 0.3M‚ 0.4M‚ 0.5M‚ 0.6M. Hypothesis: When the water concentration of a solution outside the cell is lower than the concentration inside the cell‚ water will move from the inside to the outside
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occurred because of the levels of concentration of solute in the different solutions. Since the 4 M solution had the highest concentration of solute‚ compared to the other three solutions tested‚ and a higher concentration of solute than that of the solution inside the egg‚ it was a hypertonic solution.
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salicylic acid To determine the concentration of dissolved aspirin in heated water at various times To determine the effective rate constant of the decomposition of aspirin in heated water at 85°C. Results and Discussion The molar absorptivity of salicylic acid‚ ε‚ can be calculated from the equation‚ A = εcl. A more accurate value can be obtained by finding the gradient of a graph of absorbance of the iron complex‚ A‚ against varying values of c‚ concentration of salicylic acid. The value of ε
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There are a pair of kidneys that are 1% of the weight or account for 25% of cardiac output. They spend a large amount of blood and they represent a 20 to 25% of cardiac output they control the concentration of most of the constituents of the body fluids and excrete the end products of metabolism. All living things‚ whether aquatic or terrestrial‚ are required to osmoregulation or osmotic pressure regulation. Many of them have managed to survive at
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From the results obtained and the bar graph plotted‚ it could be seen that when there was a high concentration of sugar the mass of beetroot decreased. This happened because water moved from the inside of the beetroot‚ where there was a high water potential into the sugar solution‚ which had a lower water potential. In the other four beakers where the concentration of sugar solution was less‚ the mass of the beetroot increased. This happened because water moved from the dilute sugar solution where
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environment have equal concentrations of solutes. Therefore cells in an isotonic solution do not experience osmosis. When the cell is hypotonic it has a lower concentration of solutes so water will move out of the cell. When the cell is hypertonic‚ it will have a higher concentration of solutes and water will move into the cell to attempt to reach an isotonic state. The primary purpose of this exercise is to measure the rate and direction of osmosis under different concentrations. The greater the
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level off‚ the results were recorded as the freezing point of pure water. The value was recorded in a lab notebook. For part 2 of the experiment‚ the van’t Hoff Factor of sodium nitrate was determined. 25mL of sodium nitrate was obtained and the concentration information recorded. A large test tube was filled 1/3 full of the solution and placed into the ice bath. The probe was placed in the test tube and the “collect” button pressed. The solution was stirred and once the temperature leveled off‚ the
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area of least concentrated‚ which is equal to moving down a concentration gradient. When the molecules have reached equal concentrations in both locations‚ diffusion ends and it has reached equilibrium. Molecules continue to move‚ but move in both directions equally; there is no net change! Osmosis is the movement of water. It moves water molecules across a cell membrane either in or out of the cell and still moves down the concentration gradient. The object is still to reach equilibrium. Osmotic
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