solvent. This experiment is specifically designed to measure the solubility of sodium hydroxide in waters of different temperatures.! ! Hypothesis! Higher temperature of water allow the particles of sodium hydroxide(s) more mobility between the solution and their solid state because the particles are absorbing energy from their surrounding. Therefore‚ higher the temperature of water‚ higher the solubility of sodium hydroxide. ! ! Table of variables! Variable measured Dependent Variable
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Lab Report #1 Introduction A cell’s plasma membrane is known to be selectively permeable. This implies that the membrane is selective on what substances can pass in and out of the cell. There are two methods of transport that occur through the plasma membrane. One method of transport is called active process which uses ATP energy to transport substances through the membrane. The other method is called passive process which does not require the use of ATP energy. During passive processes
Free Diffusion Molecular diffusion Solution
of a solution of a given compound and its concentration. This is normally expressed as . A = Absorbance measured = Absorptivity C = Molar concentration L = Length of cuvette Equipment: • Gilson pipette • Eppendorf tubes • Copper sulphate • Spectrophotometer • Cuvettes • Distilled water Method: 1. Use a Gilson pipette to measure out five different solutions of copper sulphate and distilled water. 2. Pour into a 1.5ml test tube‚ label each tube 1 to 5 to indicate each solution and place
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Add 200ml of distilled water‚ 40ml sucrose solution and 5g salt into three beakers respectively. Record the solutions concentrations‚ volumes‚ and weights. ②Use a cutter to cut the potato to the similar size. Record the weight of pieces potato. ③Put the three potatoes slice into each beaker. Cover the beakers with glass covers and leave them for 48 hours. ④Carefully remove the potato slices from the distilled water solution & pat it dry on a paper towel. Weight the potato slices immediately
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to develop a method for determining the concentration of three different diluted copper (II) ion solutions. We also tried to determine the concentration of copper within a penny by dissolving it in nitric acid. We used a spectrometer to measure the %Transmittance of each and were able to convert it to it absorbance in order to plot it on our calibration curve. We used test tubes to contain the solution and set the spectrometers to 20‚ which were preset by the TA. Prepare three different beakers
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other tubes show a greater change the concentration could be the factor that determines the permeability of the sucrose. The sucrose molecules are too large to pass through. Figure 1b- sucrose concentration determines the weight change. In this case based on our results as concentration increases the percent weight change is decreasing. Discussion: The purpose of this lab was to observe and analyze various factors that affect the process of diffusion and osmosis. We observed that the permeability
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pure substance. *Distillation- for liquid compounds‚ *Recrystallization- solid compounds Recrystallization - precipitation of a solid cpd. from a saturated solution in the form of crystals through cooling or evaporation -7 steps: 1) selecting the appropriate solvent 2) dissolving the solute 3) decolorizing the solution 4) removing suspended solids 5) crystallizing the solute 6) collecting and washing the crystals 7) drying the product - 2 Kinds of Impurities: 1)
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Abstract: During the lab a better agent for absorbing Procion Red Dye was trying to be found. Using the different dilutions of a stock solution and a spectrophotometer an Absorbance vs. Concentration graph was created and using the trendline from that graph it was determined which agent‚ zeolite‚ magnetic zeolite‚ or charcoal were better at absorbing the dye. From the results collected it was found that charcoal was the best at absorbing the dye‚ when moles of dye per gram of agent used were calculated
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that passing through. Biological substances such bromophenol blue and methyl orange‚ are the common substances to be used in testing of interaction of substance with the light. These solutions called pigments where they usually can absorb the visible of light that passing through it. The cleared compounds or solution also can absorb the light that is not seen through the naked eyes. The wavelength specifically used to test the absorbance level is 400 to 600 those are in nanometer unit‚ in this experiment
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Spectrophotometry was used in the lab to determine whether non-magnetized zeolite‚ magnetized zeolite‚ or charcoal was the more effective sequestration agent for Procion Red Dye. A calibration curve was created with the known concentrations and the absorbances of the Procion Red Dye dilutions at λmax. The slope of the calibration curve was used to determine the concentration of the analytes. As a result‚ charcoal was shown to be the more effective sequestration agent. Introduction PAHs‚ polycyclic
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