surface area of a cell relatively to its volume‚ then the diffusion time will decrease. Materials: Agar cubes‚ bromothymol blue- pH indicator‚ vinegar‚ ruler‚ spatula‚ beaker. Methods: I used agar cubes as cell models. The agar was cut into blocks corresponding to the sizes indicated to us in Table 1. The cubes have been dyed with bromothymol blue- pH indicator. Then they were placed into vinegar‚ where they began to turn yellow as the vinegar diffuses into the agar. I timed this diffusion process
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As the area to volume ratio increases‚ the time taken for a complete diffusion will also increase. Background Information: Agar is a jelly like substance and in this experiment‚ agar will be used is containing and acid-base indicator called “phenol” and the indicator gets the red color in basic conditions whereas it gets yellow color in acidic ones. Control Variables: * The same agar will be used for each experiment * All the experiments will be investigated in the same place
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important to keep the pH almost constant even when addition of acids or bases takes place. One can easily know if a solution is an acid or a base using a visual indicator. Indicators are organic dye added to a solution that changes color base on the concentration of H3O ions in the solution. Each color change corresponds into a pH value. Common indicators used in the laboratory are methyl orange‚ methyl red‚ bromthymol blue‚ neutral red and phenolphthalein. In this experiment‚ methyl orange and phenolphthalein
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with other solutions using several different indicators as well as a pH meter. The experiment also has the student determining what the buffer solution is in an aqueous solution. The student will also be testing the pH of milk of magnesia and will see how it affects the stomach acid. Lastly the student will be using the carbon dioxide found in their breath to neutralize a base. Apparatus and experimental setup Experiment: A. pH measurement with indicators and pH meter In this experiment the student
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Bernoulli’s principle is basically‚ a wing generates lift because the air goes faster over the top creating a region of low pressure‚ high pressure chases low pressure and thus creates lift. 3. Explain in detail how the airspeed indicator works. The Airspeed indicator works by air being forced into the pitot tube measuring and promptly indicating the difference between pitot and static pressure. These two pressures are equal when the aircraft is parked on the ground in calm air. When the aircraft
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_______________________ IV. Monitoring Neutralization Reactions by Use of Different Indicators: Color Of Acid Solution After Adding Phenolthalein # Of Drops Of Base Added For Complete Neutralization mL of Base Added The Color of Solution At the Point of Complete Neutralization 20 Drops of 1.0 M Acid HCl HC2H3O2 20 Drops of 1.0 M Acid Color of Acid Solution After Adding Universal Indicator # Of Drops Of Base Added For Complete Neutralization mL of Base Added The Color of
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chem labYoav Arjang 9/30/2012 AP Chemistry Lab Report I. Introduction: a) Title: The Establishment of a Chemical Equation Using the Method of Continuous Variation. b) Purpose: the continuous variation method is used to establish a chemical equation by displaying on a line graph the change/difference in temperature caused by the composition of acids and bases in the solution
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pH. These devices usually consist of dyes‚ paper strips or electronic pH meters. The following experiment uses paper pH indicator strips to determine soil pH. Materials · Five one quart zip lock bags · Five 3 ounce wax paper cups · Stirrer · General Range pH Indicator Paper (available from Fisher Scientific or other scientific supply distributor) · Specific Range pH Indicator Paper (available from Fisher Scientific or other scientific supply distributor) · Deionized (DI) Water Phone: (203) 974-8500
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Equilibrium and LeChatelier’s Princinple Objective: Put stresses on the systems; observe how the equilibrium’s systems react to a stress. Materials and Procedures: A. Materials 1. NaCl(s) 2. KSCN‚ 0.002M 3. Bromythymol blue indicator solution 4. AgNO3‚ 0.1 5. CoCL2 x 6H2O(s) 6. HCl‚ 12M 7. HCL‚ 0.1M 8. NaOH‚ 0.1M 9. Fe(NO3)3‚ 0.2M 10. C2H5OH(l) 11. Na2HPO4(s) 12. Test tubes 13. Beaker 14. Stirring
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peelings extract as a pH indicator. It is proposed to turn out to be extremely beneficial to schools‚ lessening the need to buy costly laboratory equipment such as litmus paper. HYPOTHESIS: I therefore hypothesize that eggplant peelings extract‚ after meticulous testing and improvising‚ could be an effective pH indicator. Variables: INDEPENDENT: The color of the eggplant peelings after being dipped in the acid/base‚ to observe its efficiency in being a pH indicator. It changes depending
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