1. Diffusion and Osmosis‚ June 4‚ 2013 2. Purpose: The purpose of this lab is to help give visual understanding of diffusion which is a solution of high concentration spontaneously (no energy required) moving to an area of low concentration. Also taking a look at osmosis‚ which is the movement of chemicals across the cell membrane. Osmosis requires some type of energy to be put in for this to happen. After these experiments we should have a better idea and visualization of how chemicals transfer
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solution is compared with color of standard solutions in different concentrations. Measuring amount of substance in solution by helping intensity of transmittance light from solution is called photometry. Devices that used for this method is called photometer. This kind of devices have filter to adjust wavelength of light. If the device has a prism to do this‚ it is called spectrophotometer. In photometric measurements‚ concentration of colorless solutions can be measured(by using UV lights).[2] Spectrophotometer
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the movement of any kind of molecule‚ osmosis is only about the movement of water molecules. To show this diffusion I will be using potato discs‚ of the same size and mass‚ in different concentrations of sugar solution to find out whether the mass of the discs increases or decreases depending on the concentration. I predict that when the sugar solution is 0% the mass will increase as there is less sugar in the water than in the potato. The water will then travel through a partly permeable membrane
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Pre Lab Experiment 8 DETERMINATION OF % COMPOSITION OF PENNIES USING REDOX AND DOUBLE DISPLACEMENT (PRECIPITATION) REACTIONS Objectives: 1. Learn how to determinate the percent composition 2. Learn how to get the percent using oxidation reduction and double reactions 3. To become more familiar with the use titration techniques 4. To learn how to get the salt out of an quimical Background: To develop and utilize procedures to determine the percent composition‚ of ZnCI2. As well titrating
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was able to absorb light due to the properties of complex ions‚ and that property helped us to determine the absorbance of different concentrations of that ions. We saw that absorbance increased as the concentration increased. Finally‚ we found the value of Kc‚ average value of different Kci and were 264.937M-1. The unit depends on the degree of species concentration. 2 Introductions: Chemical equilibrium is said when the rate of formation of product is the same like the reverse reaction‚ the reaction
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be determined. However‚ the most crucial part of structure determination is the crystallization of a protein. A protein can be difficult to crystallize because an optimal environment must be found by adjusting temperature‚ pH‚ ion concentrations‚ and even concentration of the protein itself. To understand this process‚ lysozyme‚ a well-studied protein‚ was crystallized in a total of twelve differing environments. The amount of two different solutes‚ NaCl and polyethylene glycol (PEG)‚ were adjusted
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|2.27 x 10-4 | |Trial 4 |2.26 x 10-4 | By finding the moles of EDTA used‚ the concentrations of Ca2+ and SO42- can be calculated. By finding the molarities of the two‚ the Ksp can also be calculated and the result are shown on Table 1. below Table 1. Ksp Using Molarities When comparing these values to the actual Ksp of 3.14 x 10-5
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results concluded with 0.54M of NaOH. The results of trial 1 and 3 resemble the most similar and consistent to the expected results of the experiment. Discussion of Theory: The lab as able to determine the concentration of NaOH by neutralizing the solution with HCl‚ a solution which its concentration was already known‚ this process is called titration. It works by neutralizing a solution from a weak acid/base and its
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Diffusion and Osmosis Introduction Tonicity refers to the concentration of solutes in a solution (Lab 6-7). There are three stages of tonicity: Isotonic‚ hypertonic and hypotonic. Four unknown solutions were given and labeled as followed: Solution A‚ Solution B‚ Solution C‚ and Solution D. Since potato cells were used for this type of experiment‚ in an Isotonic solution the solute and water concentration are the same as inside the cell in which the isotonic solution contains 0.9% NaCl. In other
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by UV-spectrophotometery. In this method‚ glucosamine sulphate was reacted with phenylisothiocyanate in presence of a base to yield phenylthiourea derivative. This derivative showed maximum absorbance at 240 nm. Beer’s law is obeyed in the concentration range of 5-25 µg/ml. The method was validated in terms of linearity‚ precision (relative standard deviation 1.1%)‚ accuracy and specificity. The proposed method is the only method available for spectrophotometric determination of the drug. It
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