Aim: To investigate how effect of Detergent Concentration (cont.) has on Membrane permeability of Beetroot cells. Hypothesis: I predict that as detergent concentration increases‚ the solution will become less clear‚ plus mass increases. The increases in mass will indicate that the water potential of the Beetroot cell is lower than that of the surrounding sucrose solution. The Beetroot discs will become flaccid and decrease in mass if the water potential of the surrounding solution is lower than
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This experiment aims to discover the effect of 6 different treatments on the permeability of the cell membrane. These will be distilled water‚ sucrose‚ sodium hydroxide‚ hydrochloric acid‚ ethanol and boiled water. The treatments include immersion in these solutions‚ and exposure to high temperature. The tissue used is from the taproot of a beetroot‚ and the effect on the membrane’s permeability assessed by the amount of pigment leakage that occurs. Hypothesis ==========
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Chemistry Lab Question Bank (2014-2015) Topic: Introduction 1. What is a standard solution? 2. What is a primary standard solution? Give examples. 3. What is a secondary standard solution? Give examples. 4. What is a link solution? 5. Why is KMnO4 not a primary standard solution? 6. Define equivalent weight? 7. Define end point and equivalence point? 8. Why solutions of HCl and NaOH are not primary standard solutions? 9. How many types of titrations are there? Give examples. 10. Define Molarity
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Investigating the Effect of Temperature on the Permeability of Membranes The permeability of membranes can be altered in several ways. From previous preliminary work I know that reagents‚ for example detergents and alcohol alter the arrangement of the phospholipids in the membrane allowing substances to leak out of the cell. Temperature also affects the membrane. As membranes relay on protein molecules to allow molecules to enter and leave the cell through facilitated diffusion the temperature must
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In this experiment spinach‚ DPIP‚ phosphate solutions were placed under various filters and the percent orange light transmittance through the solution was measured to determine the rate of photosynthesis. This experiment was set up to discover how different wavelengths of light affect the rate of photosynthesis in a spinach‚ DPIP‚ phosphate solution. I proposed that the spinach‚ DPIP‚ phosphate solution under no filter‚ and therefore exposed to all light will have a highest percent orange light
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Determining Red 40 Concentrations Using Absorption with Beer’s Law Introduction I like color and enjoyed learning about wavelengths and the spectrum of light‚ so I considered incorporating something related to that into my Internal Assessment. We also had just used concentrations in our Group 4 Project‚ so when I found an experiment that dealt with both of these I thought it was a great idea. This experiment is not completely original; the basic concept has been used multiple times. It uses Beer’s
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Task 3 For part of this task‚ I gathered information from a technician that works in the science department. This enabled me to gather primary information‚ giving me a basic understanding of the storage and practices within the lab before researching them on the internet. Chemical store management When storing chemicals‚ they are put into different categories‚ for example; flammables‚ corrosives‚ irritants etc. All of these different categories are stored in an external store. They are stored externally
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the results of the intensity of the color and the absorbance of the liquids with the different solvents. Solvent Results from colorimeter 0.001 Acid (Hydrochloric) 0.358 Ethanol 0.132 Hot water 0.984 Cold water-distilled water (control) 0.057 CONLUSION: The results show that hot water gave the highest average absorbance reading from the colorimeter‚ followed by hydrochloric acid‚ ethanol and cold water‚ in descending order of absorbance. The absorbance of the solvent that was
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changed during the reaction. The concentration of crystal violet will be of 4×10-5 M and the concentration of sodium hydroxide will be of 0.20 M. ASPECT 3: developing a method of obtaining data Materials: * 1 water bath * 1 Vernier colorimeter * 90mL of 0.20M Sodium Hydroxide * 90mL of 4×10-5M of Crystal Violet * 2‚ 125mL (± 5ml) beakers * 2‚ 50mL (± 5ml) beakers * 2 measuring cylinders‚ 10mL (±0.5ml) * 1 Thermometer (±1 °C) * Ice * Hot water Safety
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Distance from light/mm | Colorimeter reading/arbitrary units | | Algal balls solution | Hydrogen carbonate solution | | 1 | 2 | mean | 1 | 2 | mean | 0 | 0.52 | 0.52 | 0.52 | 0.50 | 0.50 | 0.50 | 250 | 0.52 | 0.45 | 0.49 | 0.59 | 0.63 | 0.61 | 500 | 0.50 | 0.49 | 0.50 | 0.52 | 0.55 | 0.54 | 750 | 0.47 | 0.55 | 0.51 | 0.54 | 0.53 | 0.54 | 1000 | 0.58 | 0.56 | 0.57 | 0.52 | 0.54 | 0.53 | Results Results The results do not show the general relationship between light intensity and
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