individual work and is my sole intellectual property. It does not contain the ideas or writing of other individuals/authors. _Alexandra DeWitt_____________ __5/1/13____________ Author Date _10_________ Lab Section # Increasing Sucrose Concentrations Causes the Osmotic Concentrations of Disks of Potato Tubers to Decrease Abstract: Introduction: The biological membranes are composed of phospholipid bilayers‚ each phospholipid with hydrophilic heads and hydrophobic tails‚ and proteins
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A. Osazone Formation Crystals Formed? (hot) Crystals Formed? (Cold) 5% sucrose Yes (orange) Yes (yellow) 5% glucose Yes (orange) Yes (yellow) 5% fructose Yes (brown) Yes (brown) 5% maltose Yes (orange) Yes (gold) B. Molisch Test Color of Junction Glucose Purple Sucrose Purple Starch Purple C. Bial’s Test Color Change Ribose Yellow -> Dirty Green Glucose Yellow -> Dark Yellow D. Seliwanoff’s Test Observation Sucrose 1st (Dark) Glucose 2nd (Medium) Fructose 3rd (Light) E. Benedict’s Test
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carried out to investigate at which point the potato has reached its isotonic environment. From the results‚ when the concentration increase to 0.3M‚ the mass of the potato slices decreased by -3.26%. We can conclude we see that as we increased the sucrose concentration it was a decrease in the percent change. Introduction All cells have membranes that are selectively permeable. In other words‚ they allow certain things in and certain substances are not allowed to enter the inside of the cell. Osmosis
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that bag into a beaker containing a 1.0 M solution of sucrose‚ the percent of mass lost in the bag is 10.5%. The solution in the bag is hypertonic while the solution in the beaker is hypertonic‚ which is why water moves from the bag to the beaker and the bag loses mass. b. The purpose of this experiment is to see whether or not temperature plays a role in the percent change during diffusion or osmosis. c. If the temperature of the sucrose solution in the beaker increases‚ then the percent change
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I am going to investigate osmosis when potato is placed in different concentrations of sucrose. I am aiming to witness osmosis in 5 different concentrations of sucrose. I will use 5 varying concentrations so that I have a wider spread to compare the results‚ and check that I don’t have any anomalies Prediction Osmosis is the process of diffusion of water molecules from a weaker solution into a stronger solution‚ through a semi permeable membrane. The tiny pores in the membrane
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isotonic with) as the intracellular environment of the cells. Aim The aim of this practical is to determine the isotonic concentration of sucrose in potato cells. Hypothesis If the concentration of the sucrose solution in which the potato cylinder is bathed in changes‚ then there will also be a change in the mass of the potato cylinder. Variables Independent: Sucrose concentration Dependant: Percentage change in mass Other variables in the experiment are the potato which is to be controlled by having
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The Hill Reaction tests water splitting in photosynthesis‚ and can be observed when a color change occurs. This color change will occur when a molecule is split and electrons are removed from molecular oxygen and hydrogen ions. DCIP combined with sucrose or ethanol spinach mixtures‚ will give either a green color (indicating photosynthesis occurred) or no color at all (indicating no photosynthesis occurred)‚ depending on the factors and environments to which the mixtures will be tested. In experiment
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was to test the weight of six potatoes before and after being put into different sucrose solutions. The following data was observed and collected throughout the experiment. Observations: -Qualitative: The potatoes were: Tubed shaped Yellow in color Initially hard in texture -Quantitative: Table 1: Weight of the potato in grams before and after placed in a different concentrations of sucrose solutions. Sucrose solution (M) Weight Before (g) ± 0.01 (A) Weight After (g) ± 0.01 (B) 0 4
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Abstract The basic principles of Osmosis and Diffusion were tested and examined in this lab. We examined the percent increase of mass and molarity of different concentrations of sucrose in the dialysis bag emerged in distilled water and the potato cores emerged in concentrations of sucrose. The data reinforces the principles of Osmosis and Diffusion‚ and in a biological context‚ we can simulate how water and particles move in and out of our own cells. Introduction Objective: 1
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PRODUCTION OF CITRIC ACID Introduction: Citric acid is a White solid‚C3H4OH(COOH)3‚soluble in water and slightly soluble in organic solvents‚ which melts at 153 oC. Aqueous solutions of citric acid are slightly more acidic than solutions of acetic acid. Traces of citric acid are found in numerous plants and animals‚ because it is a nearly universal intermediate product of metabolism. Large amount of the acid are found in the juice of citrus fruits‚ from which it is precipitated by the
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