(mcΔT)Substance = - [(mcΔT)Water + (CΔT)Calorimeter] Materials: Coffee-cup calorimeter Water Safety Goggles Thermometer Lab Apron Ringstand Tongs Clamp Graduated Cylinder Test tube Unknown Metal Sample Hotplate Triple Beam Balance (or other mass measuring equipment) 600 ml Beaker Procedure: 1. Follow all safety guidelines prior to starting. Clear lab station. Gather all materials. 2. Set up the coffee-cup calorimeter as shown in the previous experiment in Figure 17-1. 3. Pour
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Calorimetry Chemistry 1412 Spring 2013 Objective: Determine the calorimeter constants in a coffee cup calorimeter‚ then the calorimeter will used to determine the quantity of heat that flows in a few physical and chemical processes. Materials used: Choice I: Choice II: * Safety Goggles Safety Goggles * Distilled water Distilled water * 150 mL beaker 600 mL beaker * 50 mL graduated cylinder 50 ml graduated cylinder * Calorimeter Calorimeter
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CHEMISTRY IA: Processing CALORIMETRY QUANTITATIVE DATA TAKEN (07.05.14 and 21.15.14) Initial Pringle Mass H20 Amount Final Pringle Mass Δ Pringle Mass Initial H2O Temp (± 0.5°C) Max H2O Temp (± 0.5°C) Δ H2O Temp (± 0.5°C) SAMPLE 1 10g 225mL 1.85g 10g-1.85g=8.85g 22.3°C 59.8°C 37.5°C SAMPLE 2 10g 225mL 0.95g 10g-0.95g=9.05g 21°C 61.1°C 40.1°C SAMPLE 3 10g 225mL 1.95g 10g-1.95g=8.05g 23°C 58°C 35°C SAMPLE 4 10g 225mL 1.85g 10g-1.85g=8.15g 50.5°C 83°C
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clean fuel of the future‚ is used in products such as fertilizer‚ and it helps aid in the production of plastics‚ pharmaceuticals‚ and even margarine. Also‚ hydrogen’s low density makes it a natural choice for filling balloons and airships (Robertson 6-10). The molar volume of hydrogen gas is reliant on the number of moles of magnesium combined with excess hydrochloric acid. In simpler terms‚ the excess
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Results : Calculation : Part A Molecular weight of 1M of NaOH = 23g/mol + 16g/mol + 1g/mol = 40g/mol 1M = 40g/mol dissolved in 1L and 20g dissolved in 500ml 20g of NaOH was used to prepare 500ml of 1M NaOH. Part B Molecular weight of 1M of HCl = 35.5g/mol + 1g/mol = 36.5g/mol Specific gravity = 1.19kg/L 37% HC1 × 1.19kg/L = 0.44kg/L Convert w/v to mol/v = = 12mol/L = (12mol/L) = (1M)250ml = 20.83ml ≈ 21ml 21ml of concentrated HC1 is used to prepare 250ml of 1M of HC1. Part C For 0.1N of NaOH
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1. The final yield of the cells can be determined by use of an automated cell counter or by use of a hemocytometer (Neubauer chamber). In our laboratory‚ we determine the number of purified cells in a Neubauer-improved‚ bright line chamber with V-slash with a depth of 0.1 mm and a counting area of 0.0025 mm2 from Marienfeld (Lauda Königshofen‚ Germany‚ PN # 0650030). 2. For determination of the final cell yield‚ mix a 10 µl aliquot of the purified cells (Figure 9D) with 10 µl of trypan blue solution
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spectroscopy. This will be done by making 6 dilutions of a known compound of FeNH4(SO4)2 . Absorption spectroscopy involves placing the 6 diluted solutions into the spectrophotometer. This will measure the light absorption of the individual dilutions. The absorption values will be the y values on the Beers Law Plot. Beers Law shows that there is a relationship between absorption and concentration so the x value on the Beers Law Plot will be the concentration of the 6 diluted iron solutions. To calculate
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Post lab The unknown solution 4055 was tested by the separation scheme in order to identify the four cations that exist in it. The cations found were Ag+‚ Ba2+‚ Mn2+‚ and Ni2+. When I added 5 drops of 3M NaCl to the unknown solution‚ we had some precipitate‚ we centrifuge and then we divided to two test tubes‚ and they were put in hot water and got confirmatory tested. The Ag+ appeared to be in the solution because it melted‚ however Pb2+ didn’t. With the rest of the solution we added Na2SO4 we had
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Thermodynamics/Calorimetry Introduction: Thermochemistry investigates the relationship between chemical reactions and energy changes involving heat. The amount of heat generated or absorbed in a chemical reaction can be studied using a calorimeter. Purpose: The purpose of this laboratory was to determine the heat capacity of the calorimeter‚ and to understand thermodynamics/calorimetry by applying the calorimetry equation‚ Heat lost=Heat gained. We will use calorimetry to determine
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In the first process of the lab‚ you measure the mass of water transferred from a buret to a beaker‚ to determine the experimental mass of the water‚ and the volume of the water collected. We measured the temperature of the water so we could calculate the density of the water‚ which enabled us to calculate the actual volume of water‚ by using the density and the measured volume of water. To determine the percent error‚ we had to subtract the actual volume of water by the experimental volume of water
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