different sources Glassware: 1 250mL Erlenmeyer flask 1 150mL beaker 1 250mL beaker 1 50mL volumetric pipette Test #1 – pH Equipment/Glassware: Laptop with Logger Pro Chemicals: pH probe pH 4 buffer solution 3 10 mL beakers pH 7 buffer solution 1 support stand and clamp pH 10 buffer solution Test #2 – Conductivity Equipments/Glassware:
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CHEMICAL REACTIONS: ACID-BASE BUFFERS Short Overview Acids and bases represent two of the most common classes of compounds. Many studies have been done on these compounds‚ and their reactions are very important. Perhaps the most important reaction is the one in which an acid and base are combined‚ resulting in the formation of water (in aqueous solution) and a salt; this reaction is called neutralization. A buffer solution is a solution that contains both an acid and a salt
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0.100 M. (70 mL). Starch solution 2%. (3 mL). Safety goggles Apron Digital scale Buret Buret clamp Erlenmeyer flask Pipet bulb Ring stand Ttransfer pipet‚ 5 mL and 25 mL Volumetric flask‚ 100 mL Stopper Wash bottle Distilled water Weigh boat Beakers‚ IV. Procedures: 1) Use the 5 mL transfer pipet and the pipet bulb to measure 5.00 mL of the commercial bleach and drop into a 100 mL volumetric flask. 2) Dilute to the 100 mL mark with distilled water. Put the stopper on and mix
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* Phenolphthalein * Distilled water * Two 100mL beakers * 250mL beaker * 100mL volumetric flask with stopper * 50mL buret * 10mL volumetric pipet * Pipet pump * Retort stand * Buret clamp * Funnel * Erlenmeyer flask Procedure 1. Obtain about 30mL of vinegar in a clean‚ dry 100mL beaker. 2. Pipet one 10.00mL portion into a clean 100mL volumetric flask and dilute to the mark. 3. Stopper and invert several times to mix thoroughly. 4.
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A. Using a Pipet to Measure Volume Materials and Equipment B. 10 mL volumetric pipet Pipet rubber stopper (2) 150 mL beaker w/ 50 mL grad. mark (2) 125 mL Erlenmeyer flask Thermometer Balance Wash bottle Deionized water Procedures Let stand the 400 mL beaker filled with deionized water for 15 minutes to adapt with the room temperature and measure the temperature of the water. Measure and record the mass of an empty Erlenmeyer flask. After that‚ use a pipet to deliver 10 mL
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beaker 100mL volumetric flask with stopper 50mL buret 10mL volumetric pipet pipet bulb ring stand buret clamp stirring rod small funnel two 250mL Erlenmeyer flasks meniscus finder Procedure: 1. 10mL of vinegar was obtained in a clean‚ dry 100mL beaker. 2. One 10.00mL portion was pipeted into a clean 100mL volumetric flask and dilute to the mark. 3. The mixture was mixed by stopper and inverts it. 4. 50mL of NaOH(aq) was obtained in a clean‚ dry labeled 100mL beaker. 5. The buret was set up
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of a base solution. * To learn the technique of titration III. Theoretical Study: 1) Definitions: a. Definition of titration: Volumetric titration consists of the addition of a determined volume of titrating solution with known concentration C1 to an exact volume of solution with unknown concentration C2 to be determined. Volumetric titration is based on a reaction‚ which occurs between the titrating
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Electrolytic Conduction Introduction Electrical conductors can be classified into two types: (1) electronic conductors and (2) electrolytic conductors. Solid and molten metals‚ semiconductors‚ and some salts are examples of electronic conductors. Conduction takes place in electronic conductors by direct migration of electrons through the conductor under the influence of an applied potential. Here the atoms or ions that compose the conductor remain stationary (except for vibrations about
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solution in a clean 100-mL beaker. Then filled the buret to just above the 0 mL mark with sodium thiosulfate solution. Allowed a few milliliters to pour through the buret tip so that any trapped air can be flushed through. Then we recorded the initial buret level to the nearest 0.05 mL. As we used a clean 25-mL volumetric pipet to deliver 25.00 mL of bleach solution into a clean 250-mL volumetric flask we also added distilled water to the mark of the volumetric flask.
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tap. 2- Confirm that your 10.00 mL volumetric pipet is clean by filling to above the mark with deionized water and then letting it drain. Your pipet is a transfer pipet is a transfer pipet that is calibrated “to deliver” (TD) rather than “to contain” (TC). The last drop of liquid should not drain out of the tip of a TD pipet in normal use. However‚ there should be no water drops left on the side walls. The presence of such drops indicates that your pipet is dirty. 3- Measure and record the
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