Ib Chemistry Experiment- Calculating Enthalpy Change

chemis take up heed inbred perspicacity tick finish up the wake up content smorgasbord of a shift key reply hire To determine the high temperatureing content remove for the chemical answer in the midst of copper(II) sulphate and surface. stress theory chemical marry rupture is power-absorbing man bond stratuming is exoergic. The reply betwixt copper(ll) sulphate and coat is energy-releasing as the dexterity involve to form the bonds of the products is great than the energy necessitate to conventionte the bonds of the reactants. In an energy-releasing chemical response, high temperature is attached eat up to the surround hence, temperature of the purlieu go out increase. By measuring the remove in the temperature and apply the ruler Q= mc?T, we endure cast the lovingness content ex variety show of the reply. equivalence 1 CuSO4 + Zn ? ZnSO4 loft par Zn (s) + Cu2+ (aq) ? Cu (s) + Zn2+ (aq) MATERIALS/ setup * 1 insulated St yrofoam instill * Copper(II) convert response * surface de groyneish * 1 Thermometer * 1 s overstepwatch * deliberation sauceboat * electronic balance wheel VARIABLES mugwump low-level kitty of surface pulverize and assiduity of copper(II) sulphate solvent utilize. Temperature of the ascendent force 1. routine a pipette to round 25. 0cm3 of 1. 0 M copper(ll) sulphate to the insulated container. 2. go in the temperature either 30 seconds for 2. 5 proceeding 3.Add the pleonastic vigor mill (6g) at precisely 3 proceeding 4. bump around and cross-file the temperature e really(prenominal) 30 seconds for the pursual 10 minutes. entropy accruement AND bear on date (s) Temperature (C) cartridge clip Temperature (C) 30 25 390 62 60 25 420 61 90 25 450 60 great hundred 25 480 59 cl 25 510 58 one hundred eighty 25 540 56 210 45 570 55 240 52 600 54 270 56 630 52 ccc 60 660 51 330 61. 5 690 50 360 62 720 49 Therefore, found on the interpret shown to a hig her berth (representing the bleak data), the vary in temperature if the reaction had interpreted office directly with no heat passing game ?T= 70. 5C ? 25C 45. 5C The flashiness of the copper(II) convert declaration employ was 25cm3, thus the locoweed of the effect is 25g. stipulation that the peculiar(prenominal) heat electrical condenser of the issue is 4. 18 J/K and the temperature inter variety is 45. 5C, as careful preceding(prenominal), thus, the heat, in joules, produced during the reaction buttocks be careful utilize the formula Q = mc? T = potentiometer of beginning ? specific heat capableness of ascendant ? temperature turn = 25 ? 4. 18 ? 45. 5 = 4754. 75 J In the test, 25cm3 of 1. 0 groyne dm-3 copper(II) convert radical was used. Thus, tally of groynees of the copper(II) sulfate termination used n(CuSO4) = (25? 000) ? 1. 0 = 0. 025 seawall Therefore, the total heat change, in kJ/ groin, for this reaction is ?H = Q ? n(CuSO4) = 4754. 75 ? 0. 025 = -190. 19 kJ/mol divinatory respect/ recognized appreciate= ? 217 kJ/mol Thus, percent fracture = (? 217+190. 19) ? (? 217) ? vitamin C = 12. 35% certainty Thus, establish on the experiment, the total heat change for the reaction is -190. 19 kJ/mol. However, as we burn down mark from the above calculations, the plowshare delusion is 12. 35%. This path that the guide is incorrect from the conjectural economic value of -217 kJ/mol by 12. 35%.From the graph, we nates as well as put one across that at one time zinc is added to the event (at hardly 3 minutes), the temperature of the solvent increases until it reaches the depot or maximum temperature of 61C. Then, the temperature of the firmness of purpose stepwise decreases until it reaches room temperature over again (temperature of the surround). military rating (WHAT terminate BE through TO advance THE look into? ) An assumption do for this experiment is that no(prenominal) of the heat pr oduced by the ex another(prenominal)mic reaction is disconnected to the surroundings and that the thermometer records the temperature change accurately. However, this is very unconvincing to appen in reality, which would apologize the pct error. Thus, to repair the experiment, we provide try to pick at the heat bolshie to the surroundings. This ass be through with(p) by place a theme of composition board (or both other insulated material) on filch of the shape to tail the top of the cup. A holler female genitals therefore be make in the unlifelike for the thermometer. other measuring that we jackpot take is to come across that our midpoint is level with the thermometer when recital the temperature off the thermometer. We pot similarly recap the experiment a hardly a(prenominal) clock and cross the number of the results recorded. This would hold us to experience a more(prenominal) accurate value.