braided cotton string. Cotton consists largely of cellulose. Cellulose is the most abundant biomolecule on Earth. It is composed of six carbon (C)‚ ten hydrogen (H)‚ and five oxygen (O) atoms. Materials Required * 250mL Beaker and/or 500mL Erlenmeyer flask * metric
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errors. Once bubbles are cleared‚ the top of the buret must be connected to a 250 ml Erlenmeyer flask with a rubber tube and stopper and then must be checked for leaks by lowering the leveling bulb. This should now complete the set up for the lab experiment. Now that the experiment has been set up‚ to perform this lab‚ 10 ml of 0.10M KI and 15 ml of distilled water must be added to a 250 ml Erlenmeyer flask. The flask must then be swirled in the water bath to allow the solution to succumb to the same
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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 of the water from the beaker into the Erlenmeyer flask. Measure the mass of water and flask. For the next two trials‚ without emptying the flask‚ deliver 10 mL
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solution‚ when heated‚ it must be puted on the asbestos gauze. 2) Erlenmeyer flask. heat samples or titration. when heated‚ must open the stopper. puted on the asbestos gauze. 3) Rounded(flat)-Bottom flask. heat liquid or for distillation. It can be heated in the heating jacket. 4) Washing bottle. filled with distilled water or washing liquid. 5) Measuring cylinder. It is mainly used to measure liquid roughly. 6) Volumetric flask. prepare accurate volume standard solution or unknown concentration
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Materials: 500 ml Erlenmeyer flask 1000 ml beaker Hot plate Aluminum foil Needle Unknown liquid sample (CH3OH) Ring stand and beaker clamp Procedure: 1) Prepare 1000 ml beaker by filling with water and heat to boiling on the hot plate
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the reacting substances are combined. This is the stoichiometric point (equivalence point) in the titration. The equivalence point is detected visually using an indicator. An indicator is a substance (added at the beginning of the titration to the flask) that changes color at (or very near) the equivalence point. The point where the indicator actually changes color is called the end
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Name: Lisa Brewer iLab‚ Week # 2 CATIONS AND ANION LAB Introduction The purpose of this week’s lab is to learn to demonstrate a double-replacement reaction of ionic compounds. To accomplish this‚ two ionic compounds will be mixed together and the product will precipitate out of solution. In this procedure‚ the product must be precipitated out of the solution and then weighed. For this lab‚ lead (II) nitrate (Pb(NO3)2) and potassium chromate (K2CrO4) will be reacted together to demonstrate
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Molecular Weight (g/mol) | Melting Point (°C) | Amount used | Moles used | (+) Tartaric Acid | 150.087 | 171–174 | 11.9 g | 7.93 x 10-2 | (+‚-) α-phenylethylamine | 121.18 | 184-186 | 10.0 ml | 8.25 x 10-2 | Procedural Details In a 250 ml Erlenmeyer flask‚ (+) tartaric acid (11.9 g) was dissolved in 165 ml of methanol. This mixture was heated on a steam bath. Racemic (+‚-) α-phenylethylamine was slowly added to mix well. Solution was allowed to cool for 15-20 minutes to observe crystallization
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each other‚ again causing the percent yield to change depending on how the contamination affected the substances by producing a higher or lower percent yield. Another source of error could have been due to the transport of the aspirin from the Erlenmeyer flask after cooling to the funnel to be filtered. Some of the aspirin may have been lost or left behind and that would have showed a lower percent
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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 well. 3) Weigh
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