To distinguish between acidic‚ neutral and alkaline solutions using pH values. To classify solutions of equal concentrations in terms of acid or base strength using pH values. To understand how the appropriate use of Litmus paper‚ Universal Indicator and pH meter can give an account of different degrees of accuracy in the measurement of acidity or alkalinity of substances. 1) Define what an Acid is. Give five characteristics of acids. An acid is a chemical which‚ when dissolved in water yields
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strong base! ! Known: Acid! Unknown: Base HCl NaOH Volume! 25.00 mL 18.66 mL Molarity 0.1396 M Uknown Name! Indicator ! Methyl Orange! Turned red when mixed with the acid solution.! After adding 18.66 mL of base‚ turned orange. After having added the correct amount of base to the acid solution mixed with indicator‚ we can calculate the concentration of the base solution.! CAVA = CBVB! CB = CAVA / VB! CB = 0.1396M x 25.00 mL / 18.66 mL! CB = 3.49 M
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Virtual Lab Unit 3 1. Briefly describe the steps required to aseptically transfer bacteria from an unknown to a tube of liquid broth. You might have to research this using the "T" button (Tell Me More About...) To aseptically transfer bacteria from an unknown to a tube of liquid broth you have to flame the loop or wire before you begin to sterilize it. You then remove the caps from the tubes and flame the mouths of the tubes to prevent air-borne contamination. When all this is done‚ you have to
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application of Le Chatelier’s principle by observing the effects of acids and bases of on the solubility of Ca (OH) 2‚ the effects on Fe3+ and SCN- with Fe (SCN) 2+ to an equilibrium mixture. Also‚ finding the effects of an acid and base dealing with an indicator‚ and the effect on an acid on Ni2+‚ NH3‚ and Ni (NH3)62+. Data and Data Analysis: • Ca(OH)2 [pic] Ca2+ + 2 OH- Data: You will first add 6 drops of Ca( NO3)2 to a watch glass. Then add 6 drops of HCl then add 6 drops
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accurately one tablet into a 50 cm3 conical flask and dissolve it in 10.0cm3 of 95% alcohol. 3. Titrate with 0.10 mol dm-3 sodium hydroxide solution using two drops of phenolphthalein solution as indicator in the first trial. 4. For the next trials repeat steps 1 and 2‚ but instead of using an indicator use an electronic pH tester to measure the pH of the solution to determine when its neutral; (PH -7) . 5. Record data‚ ml used in titration to neutralize every aspirin trial. Raw Data Collection:
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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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