CALCULATIONS Determining the amount Limiting Reagent used. nlimiting reagent = Molarity x Volume or Mass / Molar Mass Example: Limiting reagent is 5mL of 1.0 M HCl nlimiting reagent = Molarity x Volume nlimiting reagent = (1.0 [mol/L]) x 0.005 [L]) = 0.005 mol Determining the qrxn and qcal. qrxn + qcal = 0 -qrxn = qcal qrxn = ΔHrxn x nlimiting reagent qcal = Ccal ΔT qrxn = - Ccal ΔT + mcsolid ΔT (note: only if there is a precipitate formed in the reaction)
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Data and Observations: Part I Table: Metal: | Aluminum | Zinc | Iron | Copper | Mass of metal: | 27.776 g | 41.664 g | 34.720 g | 41.664 g | Volume of water in the calorimeter: | 26.0 mL | 26.0 mL | 26.0 mL | 26.0 mL | Initial temperature of water in calorimeter: | 25.3 °C | 25.3 °C | 25.3 °C | 25.3 °C | Temperature of hot water and metal in hot water bath: | 100.5 °C | 100.5 °C | 100.5 °C | 100.5 °C | Final temperature reached in the calorimeter: | 38.9 °C | 34.8 °C | 34.2 °C | 34
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jpg&w=1200&h=1304&ei=wkqqULDJF8WiigeNw4GoBg&zoom=1&iact=hc&vpx=341&vpy=133&dur=798&hovh=234&hovw=215&tx=124&ty=157&sig=107531788789402472434&page=1&tbnh=142&tbnw=114&start=0&ndsp=26&ved=1t:429‚r:1‚s:0‚i:68 * http://chemistry.bd.psu.edu/jircitano/Bomb.pdf * http://www.siamzim.com/pdf/calorimeters/TN_101.pdf * http://scimed.co.uk/wp-content/uploads/Introduction-to-bomb-calorimetry.pdf * http://en.wikipedia.org/wiki/Calorimeter#Bomb_calorimeters
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409 Lab 40: Calorimetry Calorimetry is the measurement of the quantity of heat exchanged during chemical reactions or physical changes. For example‚ if the energy from an exothermic chemical reaction is absorbed in a container of water‚ the change in temperature of the water provides a measure of the amount of heat added. Calorimetry involves the use of a calorimeter. In this activity you will learn how the energy change in a physical change can be measured using a calorimeter. •
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In order to describe the molar volume of pure water the equation V_3=M_3⁄ρ_(3 ) is used‚ whereas those of sodium nitrate and the polyether compound poly(ethylene glycol) (PEG) are shown by V_1=V_(∅_1)^∞and V_1=V_(∅_2)^∞. In these two equations‚ V_(∅_1)^∞ and V_(∅_2)^∞ which are the apparent molar volumes at infinite dilution of sodium nitrate and poly(ethylene glycol)‚ must be computed on the basis of data on apparent molal volume (V_∅). The following equation shows the relation of the V_∅ of a
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Exploring Hooke’s Law and the Constant (K): Data Collection and Processing: Data of the Hanging Masses and the Caused Displacement of the Spring Mass Hanging (kg): Displacement of Spring Including Original Length (m): 0.050 0.413 0.100 0.451 0.150 0.458 0.200 0.485 0.250 0.504 0.300 0.522 0.350 0.543 0.400 0.567 0.450 0.587 0.500 0.610 0.550 0.633 0.600 0.655 0.650 0.674 0.700 0.698 Original Length of Spring (m): 0.392 Table 2.1 Constant K: 22.5kg/ms2 *Refer to attached graph and calculations.
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First‚ the buffer was prepared by using the formula as follows: Figure 1: Calculation for prepare 0.1 M potassium phosphate buffer at pH 6 3.4007g of potassium phosphate was weighed and placed in 300 mL beaker. Then‚ 125 mL of water was added into the beaker that contained potassium phosphate. The mixture was dissolved using the stirring rod‚ and then the magnetic stirring bar was placed in the beaker for further dissolve when measuring the pH. The pH meter was used to measure the solution
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1. Determining the concentration of KMnO4 from the solution created by the stockroom. 16H+ + 2MnO4- (aq) + 5C2O42- (aq) → 2Mn2+ (aq) + 10CO2 (g) + 8H2O (l) Volume of potassium manganate (KMnO4) = 32.5 mL Mass of Sodium Oxalate (NaC2O4): 0.104 [KMnO4] Calculation: = (0.104g of NaC2O4)(1 mol NaC2O4 /134.0g)(2 mol KMnO4 / 5 mol NaC2O4)(1/32.5 mL)(1000 mL /1L) = 0.00955 M KMnO4 2. Using the standardized concentration of KMnO4 calculated above to find the mass percentage of the oxalate ion Equation:
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German Beer Research compiled for The Paper Store‚ Enterprises Inc. By R. Anastasia Tremaine - March‚ 2002 VISIT www.paperwriters.com/aftersale.htm -- for more information on using this paper properly! 1.0 Introduction Beer is an immensely popular beverage‚ but it is one that is associated with a particular country. German beer in fact is seen as the king of all beers. Around the world‚ Germany’s beer is one of the most respected varieties‚ in part due to the strict legislation
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Experiment 1: Calorimetry Nadya Patrica E. Sauza‚ Jelica D. Estacio Institute of Chemistry‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines Results and Discussion Eight Styrofoam ball calorimeters were calibrated. Five milliliters of 1M hydrochloric acid (HCl) was reacted with 10 ml of 1M sodium hydroxide (NaOH) in each calorimeter. The temperature before and after the reaction were recorded; the change in temperature (∆T) was calculated by subtracting the initial temperature
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